Genesis 17:9-14

Circumcision is a sign of God's covenant with Abraham

9 God 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. 10 This is what you and all your descendants must do to obey my covenant. Every male person in your family must be circumcised. 11 Your circumcision will show that you have agreed to my covenant with you. 12 Every male child among you must be circumcised when he is eight days old. You must continue to do this for every generation of your descendants. Circumcise every male that lives with you. Circumcise your own family. Circumcise servants that have been born in your house. Also circumcise foreign servants that you have bought with money. 13 You must circumcise all the male servants who work for you in your house. Circumcision will be a mark in your bodies which shows that you accept my covenant. It will continue for all time.

14 If any male person among you has not been circumcised, I will not accept him as one of my people. He must become separate from his people. He has not obeyed my covenant.’