Zechariah 13:8-9

8 In the whole land, says the Lord, two-thirds shall be cut off and perish, and one-third shall be left alive.
9 And I will put this third into the fire, refine them as one refines silver, and test them as gold is tested. 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."
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.