Genesis 17:4

As for me. - The one party to the covenant is here made prominent, as in Genesis 17:9 the other party is brought out with like emphasis. The exalted Being who has entered into it imparts a grandeur, solemnity, and excellence to the covenant. "Father of many nations." The promise of seed is here expanded and particularized. A multitude of nations and kings are to trace their descent from Abram. This is true in a literal sense. The twelve tribes of Israel and many Arab tribes, the twelve princes of Ishmael, Keturah's descendants, and the dukes of Edom sprang from him. But it is to be more magnificently realized in a spiritual sense. "Nations" is a term usually applied, not to the chosen people, but to the other great branches of the human race. This points to the original promise, that in him should all the families of the earth be blessed. "Abraham." The father of many nations is to be called by a new name, as he has come to have a new nature, and been elevated to a new dignity. The high father has become the father of the multitude of the faithful.

17:4 The promise is here introduced with solemnity: As for me, saith the Great God, Behold, behold and admire it, behold and be assured of it, my covenant is with thee. And thou shalt be a father of many nations - This implies, That his seed after the flesh should be very numerous, both in Isaac and in Ishmael, and in the sons of Keturah. And the event answered, for there have been, and are, more of the children of men descended from Abraham, than from any one man at equal distance with him from Noah, the common root. That all believers, in every age, should be looked upon as his spiritual seed, as the father of the faithful. In this sense the apostle directs us to understand this promise, Rom 4:16,17. He is the father of those, in every nation, that, by faith, enter into covenant with God, and (as the Jewish writers express it) are gathered under the wings of the divine majesty.