Genesis 21:1-3 Gen. 21:1-3
1 And the LORD visited Sarah as he had said, and the LORD did unto Sarah as he had spoken. 2 For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him. 3 And Abraham called the name of his son that was born unto him, whom Sarah bare to him, Isaac.
Isaiah 51:2 Isa. 51:2
Look unto Abraham your father, and unto Sarah that bare you: for I called him alone, and blessed him, and increased him.
(Relation)