Genesis 17:9-11

Amplified Bible, Classic Edition

⁹ And God said to Abraham, As for you, you shall therefore keep My covenant, you and your descendants after you throughout their generations.

¹⁰ This is My covenant, which you shall keep, between Me and you and your posterity after you: Every male among you shall be circumcised.

¹¹ And you shall circumcise the flesh of your foreskin, and it shall be a token or sign of the covenant (the promise or pledge) between Me and you.