December 6, 2026

A Promised Son

Genesis 21:1-3

Sunday's Devo

December 6, 2026

Sunday's Devo

December 6, 2026

Key Verse | Genesis 21:1

The LORD visited Sarah as he had said, and the LORD did to Sarah as he had promised.

Today's Focus

Today’s Prayer Prompt

Is there something you’re waiting on God for? Tell him about it and ask for patience and faith to trust his timing.

Genesis 21:1-3

Chapter 21

The Birth of Isaac

1 The LORD visited Sarah as he had said, and the LORD did to Sarah as he had promised. 2 And Sarah conceived and bore Abraham a son in his old age at the time of which God had spoken to him. 3 Abraham called the name of his son who was born to him, whom Sarah bore him, Isaac. 1 21:3 Isaac means he laughs

Footnotes

[1] 21:3 Isaac means he laughs
Table of Contents
Introduction to Genesis

Introduction to Genesis

Timeline

Author, Date, and Recipients

Traditionally, Moses is considered to have been the author of Genesis and the rest of the Pentateuch (see Num. 33:2; Deut. 31:24; John 5:46). Of course, Moses lived much later than the events of Genesis. Presum­ably, stories were passed down about those earlier events, and Moses brought them all together.

The first audience would have been the Israelites Moses led through the wilderness. For readers today, Genesis is an essential introduction to the rest of the Bible. It is rightly called the book of beginnings.

Theme

The theme of Genesis is creation, sin, and re-creation. God made the world very good, but first cursed it and then destroyed it in the flood because of man’s disobedience. The new world after the flood was also spoiled by human sin (ch. 11). God chose Abraham for a special purpose. Through his family, all nations would be blessed (12:1–3). God’s purpose will eventually be fulfilled through Abraham’s descendants (ch. 49).

Key Themes

  1. The Lord God commissions human beings to be his representatives on earth. They are to take care of the earth and govern the other creatures (1:1–2:25).
  2. Instead of acting as God’s representatives on earth, the first man and woman—Adam and Eve—listen to the serpent and follow his advice. Their disobedience has devastating results for all mankind and for the entire created world (3:1–24; 6:5–6).
  3. God graciously announces that Eve’s offspring will free humanity from the serpent’s control (3:15). Genesis then begins tracing the history of one family that will become the people of Israel. This family has a special relationship with God and will become a source of blessing to fallen humanity (12:1–3).
  4. As a result of Adam’s disobedience, his unique relationship with the ground degenerates, resulting in hard work and later in flood and famine. But the special family descending from Adam also brings relief from the difficulties (3:17–19; 5:29; 50:19–21).
  5. While Eve’s punishment centers on pain in bearing children (3:16), women play an essential role in continuing the unique family line. With God’s help, even barrenness is overcome (11:30; 21:1–7; 25:21; 38:1–30).
  6. The corruption of human nature causes families to be torn apart (4:1–16; 13:5–8; 25:22–23; 27:41–45; 37:2–35). Although Genesis shows the reality of family conflicts, individual members of the chosen family can also help resolve those conflicts (13:8–11; 33:1–11; 45:1–28; 50:15–21).
  7. The wicked are exiled from Eden and scattered throughout the earth (3:22–24; 4:12–16; 11:9), but God is kind to his chosen people and promises them a land of their own (12:1–2, 7; 15:7–21; 28:13–14; 50:24).
  8. God is prepared to destroy almost the entire human race because of its corruption (6:7, 11–12; 18:17–33), but he still wants his world to be populated by righteous people (1:28; 9:1; 15:1–5; 35:11).

Outline

  1. Primeval History (1:1–11:26)
    1. God’s creation and ordering of heaven and earth (1:1–2:3)
    2. Earth’s first people (2:4–4:26)
    3. Adam’s descendants (5:1–6:8)
    4. Noah’s descendants (6:9–9:29)
    5. The descendants of Noah’s sons (10:1–11:9)
    6. Shem’s descendants (11:10–26)
  2. Patriarchal History (11:27–50:26)
    1. Terah’s descendants (11:27–25:18)
    2. Isaac’s descendants (25:19–37:1)
    3. Jacob’s descendants (37:2–50:26)

The Near East at the Time of Genesis

c. 2000 B.C.

The book of Genesis describes events in the ancient Near East from the beginnings of civilization to the relocation of Jacob’s (Israel’s) family in Egypt. The stories of Genesis are set among some of the oldest nations in the world, including Egypt, Assyria, Babylonia, and Elam.

The Near East at the Time of Genesis

The Global Message of Genesis

The Global Message of Genesis

The Beginning of the Redemptive Story

The book of Genesis begins the story of God’s relationship with mankind, tells the sad story of how that relationship went very wrong, and outlines God’s promised solution to that crisis—a solution that would reach its glorious conclusion in Jesus Christ.

Genesis 1 introduces the central person of the biblical story line: God is the Creator-Father-King. God created the human race in his own image, as his royal sons and daughters to establish his kingdom on earth (Gen. 1:26–28). As humanity multiplied upon the earth, they were to establish it as God’s kingdom, in which the will of God was done on earth as it was in heaven. The intended outcome was that the Creator-King would dwell among a flourishing human community in a kind of paradise-kingdom. Heaven and earth would intersect, and God would be all in all.

Despite the disastrous rebellion of the human race, this original intention for creation remains the goal of God’s cosmic restoration accomplished in Jesus Christ. The rest of redemptive history after the rebellion narrates and explains the unfolding of this cosmic restoration.

Mankind’s Rebellion

Genesis 3 recounts the crisis of redemptive history, consisting in mankind’s rebellion against God. Discontent with the role of ruling under God, Adam and Eve—enticed by Satan in the form of a serpent—grasp for equality with God. The outcome is disastrous. For their act of high treason, Adam and Eve are exiled from perfect fellowship with God in the garden of Eden and are barred from the tree of life. Sin and death enter the world. All of creation becomes enslaved to futility and corruption. Satan has successfully usurped mankind’s throne as ruler of the world (see Luke 4:5–6; John 12:31; 2 Cor. 4:4; Eph. 2:2).

God’s Judgment

Genesis 6 reports how mankind, created to fill the earth with the rule of God, fills it instead with violence (Gen. 6:11, 13). Originally created as “very good,” the earth now lies ruined because of sin (1:31; 6:12). God’s patience runs out and, in grief, he determines to destroy humanity together with the ruined earth (6:13). God reverses the creation process of Genesis 1 by opening creation’s floodgates above and below—to deluge the earth and return it to its pre-creation state of dark chaos (1:2).

All life is extinguished, with the exception of a single family. Because of Noah’s righteousness, God preserves him and his family and a remnant of the animal world in a large boat. Then, the floods subside and Noah disembarks into a washed and clean new world. This is a new beginning. Although Noah subsequently fails, as Adam did before him, the redemptive pattern is set. God intends to fulfill his original creation intentions through a humanity led by a righteous head. Unlike Adam and Noah, however, the ultimate Adam, Jesus Christ, does in fact deliver a remnant by his righteousness, so that he and they together might rule over a holy, restored world (see Rom. 5:12–21, 8:18–30; 1 Cor. 15:20–28, 42–57).

The Promise

Genesis 12:1–3 is God’s answer to the problem of mankind’s rebellion narrated in the book’s first eleven chapters. God promises Abraham a land, countless descendants, and that all the families of the earth will be blessed in him. Through Abraham’s descendants—Israel, and ultimately Israel’s royal king, Jesus—the Creator-King will reclaim his world. Blessing and life will overcome and swallow up the curse of Genesis 3. God is determined, by his grace, to restore humanity and the entire cosmos to the paradise it was in Eden.

Universal Themes in Genesis

The image of God. Genesis teaches that everyone on earth is created in the image of God (Gen. 1:26–27; 9:6). This means that we are created like God in certain ways—for example, in our ability to love, speak, create, and reason, as well as in our ability to form relationships with our fellow humans. The image of God is also seen in the way humans are to rule the earth, under God, who rules over all. Because every person is made in God’s image, every person is inherently valuable to God and is to be treated with dignity regardless of ethnicity, age, class status, or gender.

Sin and the problem of the human heart. Genesis shows clearly that the fallen human heart is filled with sin. The reason God determined to destroy mankind in the flood was that “every intention of the thoughts of his heart was only evil continually” (Gen. 6:5). Despite experiencing God’s judgment in the flood, however, mankind fell again into sin (8:21). The flood, then, did not solve the problem of humanity’s sin and rebellion. Noah and his family passed the infection of sin on to their offspring and thus to all the nations of the earth. The world’s many expressions of rebellion against their Creator stem from the deeper, more fundamental problem of the fallen heart with its wayward desires. To fulfill his original intention for creation, God must find a way to forgive sin and to transform hard hearts with new desires. This divine mission would ultimately be fulfilled in the life, death, and resurrection of Jesus Christ.

The Global Message of Genesis for Today

Marriage and sexuality. The original intention for marriage was, and still is, a permanent marriage relationship between a man and a woman, with the gift of sexuality being expressed within the freedom of this exclusive relationship. This divine ideal, set forth in Genesis 2:18–24, still stands, despite the sordid stories that Genesis records of how far short humans fall from God’s plan. We read of Lamech’s bigamy (4:19–24), Sodom’s homosexual brutality (19:1–29), Jacob’s polygamy (chs. 29–30), Shechem’s rape (34:2), Reuben’s incest (35:22; 49:4), Judah’s prostitution (38:15–18), and the adulterous desires of Potiphar’s wife (39:6–12). Jesus Christ reaffirmed the Genesis 2 ideal in his teaching, providing instruction concerning divorce in the process (Mark 10:2–12).

Ethnicity and genocide. The “table of nations” in Genesis 10 traces all of the ethnic groups and peoples of the world to their common ancestors preserved on the ark (Noah and his family). It tells of the original genealogy of the entire world. The narrator’s use of a genealogy to describe humanity’s diverse ethnic, linguistic, and geographical complexity reveals that the human race is one massive extended family. Therefore ethnic arrogance, tribal wars, racism, and the atrocity of genocide—the murder of one group by another because of ethnic difference—are incomprehensible evils, since every person is related as family to every other person upon the earth. Because of humanity’s evil heart, however, only in Christ can such ethnic strife and racial injustice find their ultimate solution.

Environment. God commissioned humanity to manage the world as his stewards and not as selfish tyrants. Humanity must represent God and his character and his will, because God ultimately rules over the created order. The Creator-King is wise, loving, holy, compassionate, good, and just, and we must reflect his character in our attitude to environmental issues. We may harness and use the resources of the earth, but must not waste, abuse, or exploit them. Creation exists for God’s glory, and its beautiful interlocking ecosystems must be protected to fulfill this purpose. Moreover, humanity is utterly dependent upon the earth and its resources for life. For all these reasons, the preservation and stewardship of creation should be an urgent and significant priority for twenty-first century global Christians.

Genesis Fact #1: In the Beginning

Fact: In the Beginning

In the Hebrew Bible, the title of Genesis is In the Beginning, the book’s first words. The English title is related to the Greek word genesis, which means “beginning.”

Deuteronomy Fact #22: Genesis through Deuteronomy

Fact: Genesis through Deuteronomy

Genesis through Deuteronomy are the foundation of the Bible. They introduce the key promises that show God’s purposes in history and prepare for the coming of Jesus Christ.

Mark Fact #12: The Sadducees

Fact: The Sadducees

The Sadducees were a small but powerful group of Jewish leaders who did not believe in the resurrection (12:18). This may have been because of their emphasis on the Pentateuch (Genesis–Deuteronomy), which does not seem to explicitly mention the resurrection. But Jesus showed them that the idea of resurrection can, in fact, be found in the Pentateuch (Mark 12:26–27).

John Fact #1: All things were made through him

Fact: All things were made through him

All things were made through him. John begins his Gospel in the same way that Genesis begins: with creation (1:1–5; Gen. 1:1). He reveals that Jesus, God’s Son, existed eternally with God the Father, and the whole creation was made through him (Col. 1:15–16; compare 1 Cor. 8:6).

Exodus Fact #1: As numerous as the stars

Fact: As numerous as the stars

As numerous as the stars. As the book of Exodus begins, some 350 years have passed since the end of Genesis. The 70 Israelites who went to Egypt have grown into a great multitude. This fulfills God’s promise to multiply Abraham’s descendants and to make them a blessing to all the nations of the world (Gen. 12:1–3; 15:5).

The Near East at the Time of Genesis

The Near East at the Time of Genesis

c. 2000 B.C.

The book of Genesis describes events in the ancient Near East from the beginnings of civilization to the relocation of Jacob’s (Israel’s) family in Egypt. The stories of Genesis are set among some of the oldest nations in the world, including Egypt, Assyria, Babylonia, and Elam.

The Near East at the Time of Genesis

The Garden of Eden

The Garden of Eden

Genesis describes the location of Eden in relation to the convergence of four rivers. While two of the rivers are unknown (the Pishon and the Gihon), the nearly universal identification of the other two rivers as the Tigris and the Euphrates suggests a possible location for Eden at either their northern or southern extremes.

The Garden of Eden

The Generations of Genesis

The Generations of Genesis

Primeval History (1:1–11:26)      
Introduction General heading Specific heading Section introduced
2:4 These are the generations of the heavens and the earth 2:4–4:26
5:1 These are the generations of Adam 5:1–6:8
6:9 These are the generations of Noah 6:9–9:29
10:1 These are the generations of the sons of Noah 10:1–11:9
11:10 These are the generations of Shem 11:10–26
Patriarchal History (11:27–50:26)      
11:27 These are the generations of Terah 11:27–25:11
25:12 These are the generations of Ishmael 25:12–18
25:19 These are the generations of Isaac 25:19–35:29
36:1, 9 These are the generations of Esau 36:1–37:1
37:2 These are the generations of Jacob 37:2–50:26
Isaac

Isaac

God had promised Abraham that the world would be blessed through his descendants. When Isaac was born to Abraham and Sarah, it was the initial fulfillment of that promise. At God’s command, Isaac was almost sacrificed by his father, but his life was spared when God provided a ram to be sacrificed in his place. This prefigured the sacrifice of God’s own Son in the place of all who would believe in him. Isaac settled in Gerar, a Philistine city, where he became prosperous. He married Rebekah, who bore him twin sons, Jacob and Esau. Although Esau was his favorite son, Isaac was tricked by Jacob into giving him the blessing intended for his older brother. (Genesis 21:1–3)

Study Notes

Gen. 21:1–2 as he had promised. See 17:16, 19, 21. at the time of which God had spoken to him. See 18:10, 14.

Study Notes

Gen. 21:3 Isaac. God had announced the name to Abraham in 17:19 (see note).

Devotion

We exist in a world where instant gratification is a rhythm of life. Much of our society is structured around getting us what we want as quickly as possible. However, all this makes it even more painful when we’re asked to wait. Waiting for promises to be fulfilled can often feel aimless or scary. 

In Genesis 12 and 15, God promised Abraham and Sarah descendants. They had assurance that they would one day have children but were asked to wait years and years before that promise would be fulfilled. As Abraham and Sarah continued to age, it grew harder to believe having a child would be possible. Years passed and they began to doubt God’s promise. At one point, Abraham and Sarah even tried to take matters into their own hands rather than wait for God to fulfill his promise. But even as Abraham and Sarah strayed, God remained faithful.   

Eventually, Abraham and Sarah learned to trust that God would do what only he could do—something miraculous. Finally, after over 20 years, “The Lord kept his word and did for Sarah exactly what he had promised.” God gave them a son, Isaac. And don’t miss this. Abraham was 100 years old when Isaac was born, and Sarah was over 90. Sarah responded in the only way she could think of, “God has brought me laughter.” They understood that a miracle was something that only God could accomplish. Allowing Abraham and Sarah to have a baby in their old age was impossible. The news was going baffle and surprise everyone! 

Through the birth of Isaac, we see foreshadowing of another promised Son. Thousands of years later, God would promise a Son to another woman who wouldn’t understand how it’d be possible. This Son would also turn tears into laughter. He would take away the sins of all who believe in him and make a way for them be with God. One day, in the future, he will come back and take away tears and pain and sickness forever. This promised Son is Jesus, and it’s him we celebrate this season. 

Questions

  1. Remember a time when you saw a promise fulfilled. What was your reaction? Did it make the waiting worth it? 
  2. Where else do you see Jesus foreshadowed in Genesis? 

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Monthly memory verse

For to us a child is born,
    to us a son is given;
and the government shall be upon his shoulder,
    and his name shall be called
Wonderful Counselor, Mighty God,
    Everlasting Father, Prince of Peace.

– Isaiah 9:6