Genesis 17:21-23

New King James Version

²¹ But My ^(A)covenant I will establish with Isaac, ^(B)whom Sarah shall bear to you at this ^(C)set time next year.” ²² Then He finished talking with him, and God went up from Abraham.

²³ So Abraham took Ishmael his son, all who were born in his house and all who were bought with his money, every male among the men of Abraham’s house, and circumcised the flesh of their foreskins that very same day, as God had said to him.