Genesis 17:1; Genesis 17:3; Genesis 17:11; Genesis 17:14

1 When Abram was ninety-nine years old, the LORD appeared to him and said, “I am God Almighty ; walk before me faithfully and be blameless.
3 Abram fell facedown, and God said to him,
11 You are to undergo circumcision, and it will be the sign of the covenant between me and you.
14 Any uncircumcised male, who has not been circumcised in the flesh, will be cut off from his people; he has broken my covenant.”