13 He that is born in thy house and he that is bought with thy money must needs be circumcised; and my covenant shall be in your flesh for an everlasting covenant.
14 And the uncircumcised male whose flesh of his foreskin is not circumcised, that person shall be cut off from his people; he has annulled my covenant.
15 And God said unto Abraham, As for Sarai thy wife, thou shalt not call her name Sarai, but Sarah shall her name be.
16 And I will bless her and give thee a son also of her; yea, I will bless her, and she shall be a mother of Gentiles; kings of peoples shall be of her.
17 Then Abraham fell upon his face and laughed and said in his heart, Shall a child be born unto him who is one hundred years old? and shall Sarah, who is ninety years old, bear?
18 And Abraham said unto God, O that Ishmael might live before thee!
19 And God said, Sarah thy wife shall bear thee a son indeed, and thou shalt call his name Isaac (laughter); and I will confirm my covenant with him for an everlasting covenant and with his seed after him.