Genesis 17:8-10 New Century Version (NCV)
8 You live in the land of Canaan now as a stranger, but I will give you and your descendants all this land forever. And I will be the God of your descendants.”
9 Then God said to Abraham, “You and your descendants must keep this agreement from now on. 10 This is my agreement with you and all your descendants, which you must obey: Every male among you must be circumcised.