Genesis 17:7-10

7And I will establish my covenant between me and you and your offspring after you throughout their generations for an everlasting covenant, to be God to you and to your offspring after you.

8And I will give to you and to your offspring after you the land of your sojournings, all the land of Canaan, for an everlasting possession, and I will be their God."

9And God said to Abraham, "As for you, you shall keep my covenant, you and your offspring after you throughout their generations.

10This is my covenant, which you shall keep, between me and you and your offspring after you: Every male among you shall be circumcised.