And many nations shall join themselves - cleaving to Him by a close union. Isaiah had so spoken of single proselytes Isaiah 56:3-6; Jeremiah had used the word of Israel’s self-exhortation after the return from Babylon; “going and weeping,” they shall go and seek the Lord their God, saying, “Come and let us join ourselves unto the Lord, in a perpetual covenant that shall not be forgotten” Jeremiah 50:4-5. This Zechariah now predicts of “many nations.” The Jews were scarcely half-restored themselves, a mere handful. They had wrought no conversions among the pagan, yet prophecy continues its unbroken voice, “many nations shall join themselves unto the Lord.”
And shall be My people - Literally, “be to Me a people.” This is exactly the history of the Christian church, unity amid diversity; many nations still retaining their national existence, yet owned by God as one people and His own. The words are those in which God adopted Israel in Egypt; “I will take you to Me for a people, and I will be your God” Exodus 6:7. This was the covenant with them, “that thou shouldest enter into covenant with the Lord thy God, that He may establish thee today for a people unto Himself, and that he may be unto thee a God” (Deuteronomy 29:12-13, add Leviticus 26:12; Deu 27:9; 1 Samuel 12:22; 2 Samuel 7:23-24; 2 Kings 11:17; 1Ch 17:22; 2 Chronicles 23:16; Jeremiah 7:23; Jeremiah 11:4). The contrary was the title of the pagan, “not a people; with whom God said, I will move Israel to jealousy” Deuteronomy 32:21. The closeness of union Jeremiah expresses; “As the girdle cleaveth to the loins of a man, so have I caused to cleave to Me the whole house of Israel and the whole house of Judah, saith the Lord, that they might be unto Me for a people and for a name and for a praise and for a glory” Jeremiah 13:11. This was the object of the existence of Israel; to this it was to be restored Jeremiah 24:7; Jeremiah 30:22; Jeremiah 31:1; Jeremiah 32:38 by conversion Ezekiel 11:20; Ezekiel 14:11; Ezekiel 36:28; Ezekiel 37:23, Ezekiel 37:27; Zechariah 8:8; to this special privilege of Israel “many nations” were to be admitted; yet not so as to be separate from Israel, for He adds, “and I will dwell in, the midst of thee,” Judah. God would dwell in His Church, formed of Israel and the Gentiles, yet so that the Gentiles should be grafted into Israel, becoming one with them.