Genesis 24:36

⁵Abraham gave all that he had to Isaac,

¹⁰Therefore she said to Abraham, “Cast out this servant and her son! For the son of this servant will not be heir with my son, Isaac.”

¹The LORD visited Sarah as he had said, and the LORD did to Sarah as he had spoken. ²Sarah conceived, and bore Abraham a son in his old age, at the set time of which God had spoken to him. ³Abraham called his son who was born to him, whom Sarah bore to him, Isaac.⁴Abraham ^[+] circumcised his son, Isaac, when he was eight days old, as God had commanded him. ⁵Abraham was one hundred years old when his son, Isaac, was born to him. ⁶Sarah said, “God has made me laugh. Everyone who hears will laugh with me.” ⁷She said, “Who would have said to Abraham that Sarah would nurse children? For I have borne him a son in his old age.”

¹⁰He said, “I will certainly return to you at about this time next year; and behold, Sarah your wife will have a son.” Sarah heard in the tent door, which was behind him.

¹¹Now Abraham and Sarah were old, well advanced in age. Sarah had passed the age of childbearing. ¹²Sarah laughed within herself, saying, “After I have grown old will I have pleasure, my lord being old also?”

¹³The LORD said to Abraham, “Why did Sarah laugh, saying, ‘Will I really bear a child when I am old?’ ¹⁴Is anything too hard for the LORD? At the set time I will return to you, when the season comes around, and Sarah will have a son.”

¹⁹Without being weakened in faith, he didn’t consider his own body, already having been worn out, (he being about a hundred years old), and the deadness of Sarah’s womb.

¹⁵God said to Abraham, “As for Sarai your wife, you shall not call her name Sarai, but her name shall be Sarah. ¹⁶I 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.”

¹⁷Then 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?” ¹⁸Abraham said to God, “Oh that Ishmael might live before you!”

¹⁹God said, “No, but Sarah, your wife, will bear you a son. You shall call his name Isaac.^[+] I will establish my covenant with him for an everlasting covenant for his offspring after him.

²⁹Abram and Nahor married wives. The name of Abram’s wife was Sarai, and the name of Nahor’s wife was Milcah, the daughter of Haran, who was also the father of Iscah. ³⁰Sarai was barren. She had no child.