Galatians 4:23 teaches that Abraham’s two sons were born in very different ways. Ishmael came through ordinary human effort, while Isaac came through God’s promise, and Paul uses that contrast to show believers which way of relating to God truly counts. The verse is written by the apostle Paul to the churches of Galatia, who were being pressed to add circumcision and the law of Moses to faith in Christ.
However, the son by the servant was born according to the flesh, but the son by the free woman was born through promise.
Galatians 4:23 (WEB)
What Galatians 4:23 Means
The phrase “the son by the servant” refers to Ishmael, born to Abraham and Hagar, a slave woman. Paul says he “was born according to the flesh,” meaning he came about through natural means, the normal course of human planning and ability. Abraham and Sarah had grown old, and Sarah’s idea to use Hagar was an attempt to make the promise happen on their own terms.
The phrase “the son by the free woman” refers to Isaac, born to Sarah, the free woman, and he “was born through promise.” His birth depended on God’s word, spoken long before it could be seen with human eyes. The verse does not say Ishmael was unloved or without a place, and it does not deny that God cared for him. What it establishes is that the child of promise was the one who came through God’s faithfulness alone.
The Context of Galatians 4:23
Galatians was written by Paul to churches he had founded in the region of Galatia, and his main concern is that his readers were being persuaded to measure their standing with God by the law. The letter argues that righteousness comes by faith in Christ, and Paul is frustrated that people who had received the gospel were turning back toward rules. In the verses just before this one, he asks whether they really listen to what the law says, and in the verses right after, he states that the Jerusalem above is free and is “the mother of us all.”
Read in that setting, the verse is an illustration rather than a side note. Paul is using the Abraham story as an allegory to show two covenants, one resting on human effort and bondage, the other resting on God’s promise and freedom. That is why the verse matters: it gives a concrete picture of the difference Paul is defending throughout the letter.
Key Phrases in Galatians 4:23
Romans 4:20-21
20 Yet, looking to the promise of God, he didn’t waver through unbelief, but grew strong through faith, giving glory to God, 21 and being fully assured that what he had promised, he was also able to perform.
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Paul returns to Abraham in Romans to show that his faith grew stronger as he gave glory to God and was fully persuaded that God could do what he had promised. This passage helps explain the trust that lies behind the phrase “through promise” in Galatians.
Hebrews 11:11
By faith, even Sarah herself received power to conceive, and she bore a child when she was past age, since she counted him faithful who had promised.
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The writer of Hebrews credits Sarah with faith in God’s promise, even though the birth seemed impossible from a human standpoint. It shows the same pattern Paul describes, where God’s faithfulness, not natural ability, brings the child of promise into being.
A Short Prayer From Galatians 4:23
Lord, you keep your promises when we cannot see how they will happen. We confess that we often reach for our own plans and our own strength, hoping they will secure the future we want. Teach us to rest in what you have spoken, to trust your timing, and to receive every good thing as a gift of your grace. Help us to live as children of promise, held not by our effort but by your faithfulness, and let that truth steady our hearts today. Amen.
