(16) A son . . . of her.--This is the first place where it was definitely promised that Abram's heir should be Sarah's own son. This must be remembered in estimating the conduct of Abram and Sarah in the matter of Hagar. They had long waited, and hoped, before taking measures of their own for the fulfilment of the promise. The rest of the verse should be translated, "she shall become (grow into) nations: kings of peoples shall become of her, that is, "shall spring from her."

Verse 16. - And I will bless her, and give thee a son also of her (the first intimation that the promised seed was to be Sarai's child), and she shall be a mother of nations; - literally, she shall become nations (cf. Ver. 4) - kings of people shall be of her.

17:15-22 Here is the promise made to Abraham of a son by Sarai, in whom the promise made to him should be fulfilled. The assurance of this promise was the change of Sarai's name into Sarah. Sarai signifies my princess, as if her honour were confined to one family only; Sarah signifies a princess. The more favours God confers upon us, the more low we should be in our own eyes. Abraham showed great joy; he laughed, it was a laughter of delight, not of distrust. Now it was that Abraham rejoiced to see Christ's day; now he saw it and was glad, Joh 8:56. Abraham, dreading lest Ishmael should be abandoned and forsaken of God, put up a petition on his behalf. God gives us leave in prayer to be particular in making known our requests. Whatever is our care and fear, should be spread before God in prayer. It is the duty of parents to pray for their children, and the great thing we should desire is, that they may be kept in covenant with Him, and may have grace to walk before him in uprightness. Common blessings are secured to Ishmael. Outward good things are often given to those children of godly parents who are born after the flesh, for their parents' sake. Covenant blessings are reserved for Isaac, and appropriated to him.And I will bless her,.... The Targum of Jonathan adds, "in her body", with fruitfulness, who before was barren, and in her soul with spiritual blessings, and in both with 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.