Also I will make him my firstborn,.... Or, "make him the firstborn"; make him great, as Jarchi interprets it; give him the blessing, the double portion of inheritance: so Christ is made most blessed for ever, and has all spiritual blessings in his hands; and is heir of all things, and his people joint-heirs with him.
Christ is God's "firstborn", or "first begotten", Heb 1:6, being begotten by him, and of him; and his firstbegotten, though none begotten after him; as the first that opened the womb, under the law, was called the firstborn, though none were ever born after; and in such sense his first begotten, as that he is his only begotten: and he is the firstborn, with respect to creatures; "he is the firstborn of every creature"; Col 1:15, being begotten and brought forth before any creature was in being, Pr 8:22, and, with respect to the saints, "he is the firstborn among many brethren", Ro 8:29, they are of the same nature, and in the same family, and in which Christ is a son, and the firstborn; and in all things he has the preeminence; and he is also "the firstborn from the dead", or "the first begotten of the dead", Col 1:18 being raised first from thence by his own power, and to an immortal life; and is the first fruits of them that sleep, and the efficient and meritorious cause of the resurrection of life, and the pattern and exemplar of it: even him the Father promises to make "higher than the kings of the earth"; having a kingdom of a superior nature to theirs, and a more extensive and durable one; and even they themselves shall be subject to him; hence he is called "King of kings", Re 19:16.
This will be when their kingdoms become his; when they shall fall down before him, and worship him, and bring their riches and glory into his kingdom, or the New Jerusalem church state, Ps 72:10. This passage is interpreted of the Messiah by the Jews .
In Shemot Rabba, s. 19. fol. 104.