Genesis 17:21-23

Darby Translation

²¹ But my covenant will I establish with Isaac, whom Sarah shall bear to thee at this appointed time in the next year.

²² And he left off talking with him; and God went up from Abraham.

²³ And Abraham took Ishmael his son, and all who were born in his house, and all who were bought with his money—every male among the people of Abraham's house—and circumcised the flesh of their foreskin on that same day, as God had said to him.