2 Samuel 18:2
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.
The verse describes David's military arrangement while Absalom was pursuing him. He divided his forces into three battalions, one under Joab, one under Abishai the son of Zeruiah and brother of Joab, and one under Ittai the Gittite. David himself intended to go forth with the people and lead the army in person. His officers, counselors, and people urged him to stay back, reasoning that his life was worth more to them than many soldiers and that he could help them better from the city. David agreed to do what they thought best.