Genesis 17
1And when Abram was ninety years old and nine, the LORD appeared to Abram, and said unto him, I am the Almighty God; walk before me, and be thou perfect.
4As for me, behold, my covenant is with thee, and thou shalt be a father of many nations.
7And 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.
8And 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.
9And God said unto Abraham, Thou shalt keep my covenant therefore, thou, and thy seed after thee in their generations.
10This is my covenant, which ye shall keep, between me and you and thy seed after thee; Every man child among you shall be circumcised.
11And ye shall circumcise the flesh of your foreskin; and it shall be a token of the covenant betwixt me and you.
12And 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.
15And God said unto Abraham, As for Sarai thy wife, thou shalt not call her name Sarai, but Sarah shall her name be.
23And Abraham took Ishmael his son, and all that were born in his house, and all that were bought with his money, every male among the men of Abraham’s house; and circumcised the flesh of their foreskin in the selfsame day, as God had said unto him. 24And Abraham was ninety years old and nine, when he was circumcised in the flesh of his foreskin. 25And Ishmael his son was thirteen years old, when he was circumcised in the flesh of his foreskin. 26In the selfsame day was Abraham circumcised, and Ishmael his son. 27And all the men of his house, born in the house, and bought with money of the stranger, were circumcised with him.