The Same Lie, a Different King

Abraham moves to the Negeb and settles in Gerar. And then he does something he has done before: he tells people that Sarah is his sister.

This is the same lie — or half-truth, as Abraham will later explain — he used in Egypt in chapter 12. Same deception. Same arrangement. Same reasoning, presumably: if people know she is my wife, I am in danger. Abimelech, king of Gerar, takes Sarah into his household.

God comes to Abimelech in a dream:

"Behold, you are a dead man because of the woman whom you have taken, for she is a man's wife." — Genesis 20:3 (ESV)

Abimelech protests. He says he acted in good faith — Abraham told him she was his sister, and Sarah herself confirmed it. He has not violated her. God acknowledges the integrity of his heart: "Yes, I know that you have done this in the integrity of your heart, and it was I who kept you from sinning against me. Therefore I did not let you touch her." But God commands him to restore Sarah and to ask Abraham — who is, God says, a prophet — to pray for him. If he does not restore her, he will die, and all who are his.

Abimelech wakes up, calls his servants, and tells them everything. They are afraid. Then he calls Abraham and confronts him: "What have you done to us? And how have I sinned against you, that you have brought on me and my kingdom a great sin? You have done to me things that ought not to be done."

Abraham explains himself. He says he thought there was no fear of God in this place and that he would be killed on account of Sarah. He also says she really is his sister — his father's daughter, though not his mother's daughter. So the statement is technically true, but deployed as a deception. He has been doing this since they left his homeland: "It is the kindness you must do me: at every place to which we come, say of me, 'He is my brother.'" This was a standing arrangement between them. Not a one-time lapse under pressure — a policy.

Abimelech restores Sarah, gives Abraham livestock, servants, and silver, and tells him to live wherever he pleases in the land. He says to Sarah: "Behold, I have given your brother a thousand pieces of silver. It is a sign of your innocence in the eyes of all who are with you." The word "brother" — using Abraham's own word for it — lands with some edge. Abraham prays for Abimelech, and God heals him and his household, which had been made barren because of the situation with Sarah.

We don't think Genesis includes this episode to embarrass Abraham. It includes it because it is true, and because it matters. Fear has a way of pulling us back to our old patterns even when we know better, even when we have seen God come through before. Abraham has been living with the covenant promises for decades. He has seen God protect him in Egypt. He knows what God has promised. And still, when he arrives somewhere new and is afraid, he reaches for the same old lie. This is how fear works. It doesn't wait for us to run out of reasons. It just moves faster than our better instincts.

Calvin reads Genesis 20 as proof that God's covenant fidelity can overrule human fear and misjudgment without excusing them. Abraham's deception is wrong. God protects the promise anyway. And notably, it is Abimelech who ends up on the moral high ground — a pagan king who insists on integrity while the covenant-carrying patriarch has just deceived his household and put his wife at risk for a second time.

Isaac Is Born

At the appointed time, Sarah gives birth to Isaac. The text is unhurried and clear: "The Lord visited Sarah as he had said, and the Lord did to Sarah as he had promised." God's timing. God's word. Fulfilled exactly.

Abraham circumcises Isaac on the eighth day, as commanded. And then Sarah speaks:

"God has made laughter for me; everyone who hears will laugh over me." — Genesis 21:6 (ESV)

The same woman who laughed in private disbelief at Mamre — the woman God confronted for laughing, the woman who denied it and was told she did — is now laughing in full, open joy. And the name she has been given for her son means laughter. God took her laugh of impossibility and turned it into her boy's name. Every time she calls him, she is calling out the very thing she once laughed about in doubt.

We find this one of the most beautiful small movements in the whole of Genesis. God doesn't just keep the promise. He redeems the doubt on the way to keeping it. The laugh of disbelief becomes the laugh of fulfilled wonder. He turns the laugh.

Hagar and Ishmael Again

Joy does not resolve all family tension. As Isaac grows, Sarah sees Ishmael laughing — or playing, or mocking, depending on the translation — and something in her breaks. She demands that Abraham send Hagar and Ishmael away. "Cast out this slave woman with her son, for the son of this slave woman shall not be heir with my son Isaac."

Abraham is distressed. Ishmael is his son. He loves him. But God tells Abraham to listen to Sarah, because the covenant line runs through Isaac. And God promises: "As for the son of the slave woman, I will make a nation of him also, because he is your offspring."

Abraham rises early the next morning — there is a heavy sadness in that detail — and gives Hagar bread and a skin of water, places it on her shoulder, and sends her away with the boy. They wander in the wilderness of Beersheba. The water runs out. Hagar places Ishmael under a bush — she says she cannot watch him die — and walks away and sits at a distance, weeping.

But God hears the boy's cry:

"And God heard the voice of the boy, and the angel of God called to Hagar from heaven and said to her, 'What troubles you, Hagar? Fear not, for God has heard the voice of the boy where he is. Up! Lift up the boy, and hold him fast with your hand, for I will make him into a great nation.'" — Genesis 21:17–18 (ESV)

God opens Hagar's eyes, and she sees a well. She fills the skin and gives the boy a drink. The text says God was with the boy as he grew up. He settled in the wilderness of Paran and became an expert with the bow. His mother got him a wife from Egypt.

This is the second time Hagar has been found by God in the wilderness. The first time, she was pregnant and alone, fleeing Sarai's household. Now she is there with her son and water that has run out, watching him die. And God hears. Again. He does not save Ishmael because of the covenant with Abraham — though that is also true. He saves Ishmael because He heard the boy crying. The name Ishmael — God hears — continues to be accurate. God's care for Hagar and Ishmael is not incidental to this story. It is part of how Genesis shows us that God's attention extends beyond the line He has specifically designated. Isaac is the covenant heir. Ishmael is not forgotten.

The Treaty at Beersheba

Abimelech sees that God is with Abraham. So he comes to him with his army commander and proposes a mutual non-aggression oath. Abraham agrees, but first raises a complaint about a well that Abimelech's servants had seized. Abimelech says he has no knowledge of it and no report of it until now. They settle it — Abraham gives Abimelech sheep and oxen, and separately sets apart seven ewe lambs as a witness that he dug the well. They make an oath. The place is called Beersheba, meaning well of seven or well of the oath.

Abraham plants a tamarisk tree there and calls on the name of the Lord, the Everlasting God. He dwells in the land of the Philistines for many days.

The treaty is practical and political and also theological. Abraham navigates it honestly — he raises the well dispute, insists on clarity, and settles it fairly. And then he worships. Covenant faith is not only the dramatic moments on mountains. It is also wells and treaties and oaths and the choice to be honest about grievances before entering into agreements. It is living before God in the ordinary negotiations of life.

Last updated: March 3, 2026.

Scripture quotations are from the ESV® Bible (The Holy Bible, English Standard Version®), © 2001 by Crossway, a publishing ministry of Good News Publishers.