2 Samuel 18:1-2

King James Version

18 And David numbered the people that were with him, and set captains of thousands, and captains of hundreds over them.

² 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.