Genesis 17:7-10

7I will confirm my covenant that is between me and you and your future offspring throughout their generations. It is a permanent covenant to be your God and the God of your offspring after you.

8And to you and your future offspring I will give the land where you are residing — all the land of Canaan — as a permanent possession, and I will be their God.”

9God also said to Abraham, “As for you, you and your offspring after you throughout their generations are to keep my covenant.

10This is my covenant between me and you and your offspring after you, which you are to keep: Every one of your males must be circumcised.