Genesis 17:7-10

7My covenant with you is very strong. I am making it with you and with your descendants. It will continue for generation after generation of your descendants, for all time. I will be your God. I will also be the God of all your descendants.

8You are now living here in Canaan as a foreign person. But I will give all of this land to you and to your descendants. It will belong to them for ever. I will be their God.’

9God continued to speak to Abraham. He said, ‘As for you, you must agree to obey me. You must obey the rules of my covenant. You, and all your descendants after you must obey it.

10This is what you and all your descendants must do to obey my covenant: Every male person in your family must be circumcised.