Genesis 17:21-23

New Catholic Bible

²¹ But I will establish my covenant with Isaac. Sarah shall give birth to him by this time next year.” ²² God thus finished speaking to Abraham, and rising into the heavens, he left him.

²³ Abraham therefore took Ishmael his son and all those born into his house and all those whom he had bought—all the males belonging to the household of Abraham—and he circumcised the flesh of their foreskins that same day, as the Lord had commanded him.