Short answer: Genesis 21 celebrates the long-awaited birth of Isaac, records the difficult expulsion of Hagar and Ishmael, and ends with a treaty between Abraham and Abimelech at Beersheba. The chapter demonstrates God's faithfulness to His promises, His care for the outcast, and His provision for His people.
Introduction
After twenty-five years of waiting, the promise is fulfilled. Genesis 21 opens with the birth of Isaac, whose name ('he laughs') forever memorializes the laughter of both Abraham and Sarah. But joy is followed by conflict: Sarah demands the expulsion of Hagar and Ishmael, and Abraham faces one of the most painful family crises of his life. The chapter moves from the joy of fulfilled promise to the pain of family division, demonstrating that God's blessings often come with profound challenges that test our faith and character.
Yahweh visited Sarah as he had said, and Yahweh did to Sarah as he had spoken. Sarah conceived, and bore Abraham a son in his old age, at the set time of which God had spoken to him. Abraham called his son who was born to him, whom Sarah bore to him, Isaac. Abraham circumcised his son, Isaac, when he was eight days old, as God had commanded him. Abraham was one hundred years old when his son, Isaac, was born to him.
Genesis 21:1-5 (World English Bible)
The Birth of Isaac (21:1-7)
Yahweh visits Sarah as He had said, and she conceives and bears a son. Abraham circumcises Isaac on the eighth day, and Sarah declares, 'God has made me laugh. Everyone who hears will laugh with me.' God's timing is perfect — He does what He promises, even when human patience has run out. The fulfillment of God's promise after twenty-five years of waiting is a powerful testimony to divine faithfulness. Abraham was seventy-five when he left Haran (12:4) and one hundred when Isaac was born (21:5). The long wait was not a delay in God's plan but part of it — teaching Abraham and Sarah that God's timing is perfect and that His promises are worth waiting for.
Yahweh visited Sarah as he had said, and Yahweh did to Sarah as he had spoken. Sarah conceived, and bore Abraham a son in his old age, at the set time of which God had spoken to him. Abraham called his son who was born to him, whom Sarah bore to him, Isaac. Abraham circumcised his son, Isaac, when he was eight days old, as God had commanded him. Abraham was one hundred years old when his son, Isaac, was born to him. Sarah said, “God has made me laugh. Everyone who hears will laugh with me.” She said, “Who would have said to Abraham that Sarah would nurse children? For I have borne him a son in his old age.”
Genesis 21:1-7 (World English Bible)
Hagar and Ishmael Expelled (21:8-21)
At Isaac's weaning, Sarah sees Ishmael mocking and demands that Abraham drive out Hagar and her son. Abraham is deeply distressed, but God reassures him. Hagar and Ishmael wander in the wilderness until their water runs out. Hagar weeps, but God hears Ishmael's cry and opens her eyes to see a well. Ishmael grows up in the wilderness of Paran. The wilderness account of Hagar and Ishmael is one of the most poignant in Scripture. Hagar places her son under a bush and distances herself, unable to watch him die. But God hears Ishmael's cry — the name Ishmael means 'God hears' — and provides water. This episode demonstrates that God's care extends beyond the covenant line. Hagar, who twice encounters God in the wilderness (Genesis 16 and 21), becomes a testament to God's compassion for the outcast.
The child grew and was weaned. Abraham made a great feast on the day that Isaac was weaned. Sarah saw the son of Hagar the Egyptian, whom she had borne to Abraham, mocking. Therefore she said to Abraham, “Cast out this servant and her son! For the son of this servant will not be heir with my son, Isaac.” The thing was very grievous in Abraham’s sight on account of his son. God said to Abraham, “Don’t let it be grievous in your sight because of the boy, and because of your servant. In all that Sarah says to you, listen to her voice. For your offspring will be named through Isaac. I will also make a nation of the son of the servant, because he is your child.” Abraham rose up early in the morning, and took bread and a container of water, and gave it to Hagar, putting it on her shoulder; and gave her the child, and sent her away. She departed, and wandered in the wilderness of Beersheba. The water in the container was spent, and she put the child under one of the shrubs. She went and sat down opposite him, a good way off, about a bow shot away. For she said, “Don’t let me see the death of the child.” She sat opposite him, and lifted up her voice, and wept. God heard the voice of the boy. The angel of God called to Hagar out of the sky, and said to her, “What troubles you, Hagar? Don’t be afraid. For God has heard the voice of the boy where he is. Get up, lift up the boy, and hold him with your hand. For I will make him a great nation.” God opened her eyes, and she saw a well of water. She went, filled the container with water, and gave the boy a drink. God was with the boy, and he grew. He lived in the wilderness, and as he grew up, became an archer. He lived in the wilderness of Paran. His mother got a wife for him out of the land of Egypt.
Genesis 21:8-21 (World English Bible)
The Treaty at Beersheba (21:22-34)
Abimelech approaches Abraham, acknowledging that God is with him in all he does. The two men make a covenant at Beersheba ('well of the oath'), settling a dispute over a well. Abraham plants a tamarisk tree and calls on the name of Yahweh, the Everlasting God. The treaty at Beersheba establishes an important pattern of peaceful coexistence between God's people and their neighbors. Abraham's willingness to resolve disputes through covenant rather than conflict sets an example for his descendants. The name Beersheba ('well of the oath') commemorates both the covenant and God's provision, serving as a perpetual reminder that God's people are called to be peacemakers.
At that time, Abimelech and Phicol the captain of his army spoke to Abraham, saying, “God is with you in all that you do. Now, therefore, swear to me here by God that you will not deal falsely with me, nor with my son, nor with my son’s son. But according to the kindness that I have done to you, you shall do to me, and to the land in which you have lived as a foreigner.” Abraham said, “I will swear.” Abraham complained to Abimelech because of a water well, which Abimelech’s servants had violently taken away. Abimelech said, “I don’t know who has done this thing. You didn’t tell me, and I didn’t hear of it until today.” Abraham took sheep and cattle, and gave them to Abimelech. Those two made a covenant. Abraham set seven ewe lambs of the flock by themselves. Abimelech said to Abraham, “What do these seven ewe lambs, which you have set by themselves, mean?” He said, “You shall take these seven ewe lambs from my hand, that it may be a witness to me, that I have dug this well.” Therefore he called that place Beersheba, because they both swore an oath there. So they made a covenant at Beersheba. Abimelech rose up with Phicol, the captain of his army, and they returned into the land of the Philistines. Abraham planted a tamarisk tree in Beersheba, and called there on the name of Yahweh, the Everlasting God. Abraham lived as a foreigner in the land of the Philistines many days.
Genesis 21:22-34 (World English Bible)
Frequently Asked Questions
Why did Sarah demand that Hagar and Ishmael be expelled?
Sarah demanded Hagar and Ishmael's expulsion because she saw Ishmael 'mocking' Isaac during the weaning celebration. Paul interprets this in Galatians 4:29 as persecution. Sarah understood that Ishmael's attitude threatened Isaac's position as the child of promise. While her demand seems harsh, it aligned with God's sovereign plan to establish the covenant through Isaac alone.
How did God care for Hagar and Ishmael in the wilderness?
God cared for Hagar and Ishmael by hearing their cry and providing for their physical needs. When their water was gone and Hagar had given up hope, God opened her eyes to see a well. This is the same Hagar who encountered God at Beer Lahai Roi in Genesis 16 — the God who sees. God also fulfilled His promise to make Ishmael a great nation.
What is the significance of Beersheba in biblical history?
Beersheba means 'well of the oath,' commemorating the covenant between Abraham and Abimelech. It later became the southern boundary of the Promised Land — hence the phrase 'from Dan to Beersheba.' It was the home of Isaac and Jacob and remained an important center throughout Israel's history.
Biblical fidelity check
This article is grounded in the World English Bible (WEB) text of Genesis 21. The interpretation of Ishmael's 'mocking' as persecution follows Paul's inspired commentary in Galatians 4:29. The twenty-five year wait between God's initial promise and Isaac's birth is chronologically precise.
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