And many nations shall be joined to the LORD in that day, and shall be my people: and I will dwell in the midst of thee, and thou shalt know that the LORD of hosts hath sent me unto thee.
And many nations shall be joined to the Lord in that day. The result of the Jews' exile in Babylon was that, at their subsequent return, through the diffusion of knowledge of their religion, many Gentiles became proselytes, worshipping in the court of the Gentiles (1 Kings 8:41). Cyrus, Darius, Alexander, Ptolemy, Philadelphus, Augustus, and Tiberius, paid respect to the temple by sending offerings (Grotius). But all this is but a shadow of the future conversion of the Gentiles which shall result from Yahweh in glory dwelling in Jerusalem (Psalms 102:15-16, and the confession, by "every tongue, that Jesus is Lord," will then fully redound "to the glory of God the Father;" Philippians 2:10-11).
Thou shalt know that the Lord of hosts hath sent me unto thee - "unto thee" is here added to the same formula (Zechariah 2:9). Zion first shall "know (generally) that Yahweh of hosts hath sent" Messiah, by the judgments inflicted by Him on her foes. Subsequently, she shall know experimentally the particular sending of Messiah unto her. Yahweh here says, "I will dwell" (Zechariah 2:10), and then that JEHOVAH (Yahweh) of hosts sent Him; therefore Yahweh the Sender and Yahweh the Sent must be One.