Genesis 21:1-7 - The Birth Of Isaac
1 And Jehovah visited Sarah as he had said, and Jehovah did to Sarah as he had spoken. 2 And Sarah conceived, and bore Abraham a son in his old age, at the appointed time of which God had spoken to him. 3 And Abraham called the name of his son who was born to him, whom Sarah bore to him, Isaac. 4 And Abraham circumcised his son Isaac, being eight days old, as God had commanded him. 5 And Abraham was a hundred years old when his son Isaac was born to him.
6 And Sarah said, God has made me laugh: all that hear will laugh with me. 7 And she said, Who would have said to Abraham, Sarah will suckle children? For I have borne him a son in his old age.