And on that day there shall be inscribed on the bells of the horses, “Holy to the LORD.” And the pots in the house of the LORD shall be as the bowls before the altar.
Here, we see the very end of Zechariah's book, the last verse. Zechariah is speaking of the Day when Jesus (the coming Messiah, the Lord) will rule on earth during the Millennial kingdom. John Walvoord explains the verse in his commentary:
In that day holiness will characterize millennial life (cf. 8:3) whether it be in public life (the bells of the horses), religious life (the cooking pots in the LORD‘s house, the millennial temple, Ezek. 40–43), or private life (every pot in Jerusalem and Judah). Perhaps the general thought is the removal of a dichotomy between secular and sacred. In the Old Testament a Canaanite had become symbolic of anything ceremonially unclean and ungodly (the dishonest “merchant” in Hosea 12:7 is lit., “the Canaanite”). In the millennial temple no such defilement will occur. Thus Zechariah’s prophetic book which began with a call to repentance (Zech. 1:2–6) concludes with an affirmation that all will be holy to the LORD (14:20–21). Because He is the LORD Almighty and the Holy One, He will establish holiness throughout the glorious Millennium!Lindsey, F. D. (1985). Zechariah. In J. F. Walvoord & R. B. Zuck (Eds.), The Bible Knowledge Commentary: An Exposition of the Scriptures (Vol. 1, pp. 1571–1572). Wheaton, IL: Victor Books.
I like even better Gill's Exposition. What a joyous time it will be, when ALL is holy!
Yea, every pot in Jerusalem and in Judah shall be holiness unto the Lord of hosts,.... Such will be the number of sacrifices and sacrificers, that the pots in the Lord's house will not be sufficient; wherefore every pot, in city or country, shall be sanctified and devoted to holy uses:
and all they that sacrifice shall come and take of them, and seethe therein; this denotes, as before, the general holiness of the professors of religion in those times; and that there will be no difference in the vessels of the Lord's house, or any distinction of Jew and Gentile; but they will be all spiritual worshippers, and offer up the spiritual sacrifices of prayer and praise to the Lord