Genesis 17:21

¹⁹And God said to Abraham, Yea, behold, Sarah thy wife shall bear thee a son, and thou shalt call his name Isaac; and I will establish my covenant with him, for an everlasting covenant, to be a God to him and to his seed after him.

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.

— Genesis 17:21 —

²²And he left off speaking with him, and God went up from Abraham.

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.