For it is written, that Abraham had two sons, the one by a bondmaid, the other by a freewoman. For it is written - Viz. in Genesis 16:15; Genesis 22:1, etc., that Abraham had two sons, Ishmael and Isaac; the one; Ishmael, by a bond maid, Hagar; the other, Isaac, by a free woman, Sarah.
Related Commentaries of Galatians 4:22
Galatians 4:22
22 For it is written, that Abraham had two sons, the one by a bondmaid, the other by a freewoman.