Genesis 17:22

²⁰And as for Ishmael, I have heard thee: Behold, I have blessed him, and will make him fruitful, and will multiply him exceedingly; twelve princes shall he beget, and I will make him a great nation.

²¹But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.

— Genesis 17:22 —

²³And Abraham took Ishmael his son, and all that were born in his house, and all that were bought with his money, every male among the men of Abraham’s house; and circumcised the flesh of their foreskin in the selfsame day, as God had said unto him.

²⁴And Abraham was ninety years old and nine, when he was circumcised in the flesh of his foreskin.