Genesis 21:1-3

Young's Literal Translation

21 And Jehovah hath looked after Sarah as He hath said, and Jehovah doth to Sarah as He hath spoken;

² and Sarah conceiveth, and beareth a son to Abraham, to his old age, at the appointed time that God hath spoken of with him;

³ and Abraham calleth the name of his son who is born to him, whom Sarah hath born to him -- Isaac;