Genesis 17:22

²⁰And concerning Ishmael, behold, I have heard thee, and, behold, I have blessed him, and will increase him and multiply him exceedingly; twelve nations shall he beget, and I will make him a great nation.

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

— Genesis 17:22 —

²³And Abraham took Ishmael his son, and all his homeborn servants, and all those bought with money, and every male of the men in the house of Abraham, and he circumcised their foreskins in the time of that day, according as God spoke to him.

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