Zechariah 13:8-9

8In the whole land,” declares the LORD, “two-thirds will be struck down and perish; yet one-third will be left in it. 9This third I will put into 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.’ ”