the blessing of eternal life: and give thee a son also of her; as he had given him one of Hagar: God had before promised Abraham a son that should be his heir, but he had not till now told him that he should be born of Sarah his wife: yea, I will bless her; which is repeated for the confirmation of it, and for the greater strengthening Abraham's faith in it: and she shall be a mother of nations; of the twelve tribes of Israel; of the two nations of Israel and Judah: kings of people shall be of her; as David, Solomon, and others, and especially the King Messiah.