Galatians 4:22-23

For it is written in the law about Abraham's two sons [Gen. 16]; one [was] by his slave woman [Hagar] and the other by the free woman, [his wife, Sarah].

Treasury of Scripture Knowledge

Summary

And Hagar bare Abram a son: and Abram called his son's name, which Hagar bare, Ishmael.

Bible References

Hagar

Galatians 4:22
For it is written in the law about Abraham's two sons [Gen. 16]; one [was] by his slave woman [Hagar] and the other by the free woman, [his wife, Sarah].