Genesis 17:9-11

King James Version

⁹ And God said unto Abraham, Thou shalt keep my covenant therefore, thou, and thy seed after thee in their generations.

¹⁰ This is my covenant, which ye shall keep, between me and you and thy seed after thee; Every man child among you shall be circumcised.

¹¹ And ye shall circumcise the flesh of your foreskin; and it shall be a token of the covenant betwixt me and you.