Genesis 17:21-23

New Century Version

²¹ But I will make my agreement with Isaac, the son whom Sarah will have at this same time next year.” ²² After God finished talking with Abraham, God rose and left him.

²³ Then Abraham gathered Ishmael, all the males born in his camp, and the slaves he had bought. So that day Abraham circumcised every man and boy in his camp as God had told him to do.