Genesis 21:2 YLT

¹  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;

⁴  and Abraham circumciseth Isaac his son, 'being' a son of eight days, as God hath commanded him.