Zechariah 13:8-9

8And in all the land, declares the LORD, two-thirds will be cut off and perish, but a third will be left in it.9This third I will bring through the fire; I will refine them like silver and test them like gold. They will call on My name, and I will answer them. I will say, ‘They are My people,’ and they will say, ‘The LORD is our God.’”