'Third' in the Bible

And in the third, white horses; and in the fourth, horses of mixed colour.

And it will come about that in all the land, says the Lord, two parts of it will be cut off and come to an end; but the third will be still living there.

And I will make the third part go through the fire, cleaning them as silver is made clean, and testing them as gold is tested: and they will make their prayer to me and I will give them an answer: I will say, It is my people; and they will say, The Lord is my God.