'Third' in the Bible

It came even to pass on the third day, that, behold, a man came out of the camp from Saul with his clothes rent, and earth upon his head: and so it was, when he came to David, that he fell to the earth, and did obeisance.

And his second, Chileab, of Abigail the wife of Nabal the Carmelite; and the third, Absalom the son of Maacah the daughter of Talmai king of Geshur;

David also conquered Moab, then measured them with a cord, making them lie down on the ground. He executed everyone measured out in each two lengths' measurement of the cord, but spared the ones measured out by every third length. Then the Moabites were placed under servitude to David, and made to pay tribute.

And David sent forth a third part of the people under the hand of Joab, and a third part under the hand of Abishai the son of Zeruiah, Joab's brother, and a third part under the hand of Ittai the Gittite. And the king said unto the people, I will surely go forth with you myself also.