Zechariah 6:15 - Matthew Poole's English Annotations on the Holy Bible

This verse hath certainly a double reference, one to the Jews, and the building of the material temple, which is the literal and historical sense; the other mystical, and refers to the bringing in of the Gentiles. They that are far off; such Jews as do now abide in Babylon and Persia, or other remote parts. It is also the character of the Gentiles, Acts 2:39 Ephesians 2:13,17. Shall come and build in the temple; the Jews did so with their gifts, came to Jerusalem and built with their brethren; the Gentiles are come in and build the spiritual temple. Ye shall know that the Lord of hosts hath sent me unto you; the accomplishment of this shall prove my words to be God's word, and that I am sent of him. This shall come to pass; the literal part shall come to pass in your day, if ye will obey the voice of the Lord your God speaking by me. The mystical part shall come to pass also; and, if you will believe and obey, the Gentiles shall come in and be your brethren, make up one church with you, and help to build the temple, the spiritual temple; but if you obey not, you shall be cast out, and the Gentiles be taken in, to be God's people, and to build his temple.