Exodus Chapter 4, Verse 22
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22: And thou shalt say unto Pharaoh, Thus saith the LORD, Israel
is my son, even my firstborn:
22: And thou shalt say to Pharao, These things saith the Lord, Israel [is] my first-born.
In order that Pharaoh might form a true estimate of the solemnity of the divine command, Moses was to make known to him not only the relation of Jehovah to Israel, but also the judgment to which he would be exposed if he refused to let Israel go. The relation in which Israel stood to Jehovah was expressed by God in the words, "Israel is My first-born son." Israel was Jehovah's son by virtue of his election to be the people of possession (Deut 14:1-2). This election began with the call of Abraham to be the father of the nation in which all the families of the earth were to be blessed. On the ground of this promise, which was now to be realized in the seed of Abraham by the deliverance of Israel out of Egypt, the nation of Israel is already called Jehovah's "son," although it was through the conclusion of the covenant at Sinai that it was first exalted to be the people of Jehovah's possession out of all the nations (Ex 19:5-6). The divine sonship of Israel was therefore spiritual in its nature: it neither sprang from the fact that God, as the Creator of all nations, was also the Creator, or Begetter, and Father of Israel, nor was it founded, as Baumgarten supposes, upon "the physical generation of Isaac, as having its origin, not in the power of nature, but in the power of grace." The relation of God, as Creator, to man His creature, is never referred to in the Old Testament as that of a father to a son; to say nothing of the fact that the Creator of man is Elohim, and not Jehovah. Wherever Jehovah is called the Father, Begetter, or Creator of Israel (even in Deut 32:18; Jer 2:27; Isa 44:8; Mal 1:6 and Mal 2:10), the fatherhood of God relates to the election of Israel as Jehovah's people of possession. But the election upon which the υἱοθεσία of Israel was founded, is not presented in the aspect of a "begetting through the Spirit;" it is spoken of rather as acquiring or buying (קנה), making (עשׂה), founding or establishing (כּנן, Deut 32:6). Even the expressions, "the Rock that begat thee," "God that bare thee" (Deut 32:18), do not point to the idea of spiritual generation, but are to be understood as referring to the creation; just as in Ps 902, where Moses speaks of the mountains as "brought forth" and the earth as "born." The choosing of Israel as the son of God was an adoption flowing from the free grace of God which involved the loving, fatherly treatment of the son, and demanded obedience, reverence, and confidence towards the Father (Mal 1:6). It was this which constituted the very essence of the covenant made by Jehovah with Israel, that He treated it with mercy and love (Hos 11:1; Jer 31:9, Jer 31:20), pitied it as a father pitieth his children (Ps 10313), chastened it on account of its sins, yet did not withdraw His mercy from it (2 Sam 7:14-15; Ps 8931-35), and trained His son to be a holy nation by the love and severity of paternal discipline. - Still Israel was not only a son, but the "first-born son" of Jehovah. In this title the calling of the heathen is implied. Israel was not to be Jehovah's only son, but simply the first-born, who was peculiarly dear to his Father, and had certain privileges above the rest. Jehovah was about to exalt Israel above all the nations of the earth (Deut 28:1).

