5 Your name will no more be called Abram, but your name will be Abraham; for I have made you the father of a multitude of nations.
10 This is my covenant, which you shall keep, between me and you and your offspring after you. Every male among you shall be circumcised.
16 I will bless her, and moreover I will give you a son by her. Yes, I will bless her, and she will be a mother of nations. Kings of peoples will come from her."
17 Then Abraham fell on his face, and laughed, and said in his heart, "Will a child be born to him who is one hundred years old? Will Sarah, who is ninety years old, give birth?"
19 God said, "No, but Sarah, your wife, will bear you a son. You shall call his name Isaac.17:19 Isaac means "he laughs". I will establish my covenant with him for an everlasting covenant for his offspring after him.
23 Abraham took Ishmael his son, all who were born in his house, and all who were bought with his money: every male among the men of Abraham’s house, and circumcised the flesh of their foreskin in the same day, as God had said to him.