Zechariah 6:3; Zechariah 13:8-9

3 with the third chariot white horses, and with the fourth chariot strong dappled horses.
8 "It will come about in all the land," Declares the LORD , "That two parts in it will be cut off and perish; But the third will be left in it. 9 "And I will bring the third part through the fire, Refine them as silver is refined, 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 my God.' "