Genesis 17:9

6 And I will make thee exceeding fruitful, and I will make nations of thee, and kings shall come out of thee.

7 And I will establish my covenant between me and thee and thy seed after thee in their generations for an everlasting covenant, to be a God unto thee, and to thy seed after thee.

8 And I will give unto thee, and to thy seed after thee, the land wherein thou art a stranger, all the land of Canaan, for an everlasting possession; and I will be their God.

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.

12 And he that is eight days old shall be circumcised among you, every man child in your generations, he that is born in the house, or bought with money of any stranger, which is not of thy seed.