'Third' in the Bible

with the third chariot white horses, and with the fourth chariot strong dappled horses.

“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.

“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.’”