2 Samuel 18:2

18:2 David then sent out the army – a third under the leadership of Joab, a third under the leadership of Joab’s brother Abishai son of Zeruiah, and a third under the leadership of Ittai the Gittite. The king said to the troops, “I too will indeed march out with you.”

2 Samuel 18:11-15

18:11 Joab replied to the man who was telling him this, “What! You saw this? Why didn’t you strike him down right on the spot? I would have given you ten pieces of silver and a commemorative belt!”

18:12 The man replied to Joab, “Even if I were receiving a thousand pieces of silver, I would not strike the king’s son! In our very presence the king gave this order to you and Abishai and Ittai, ‘Protect the young man Absalom for my sake.’ 18:13 If I had acted at risk of my own life – and nothing is hidden from the king! – you would have abandoned me.”

18:14 Joab replied, “I will not wait around like this for you!” He took three spears in his hand and thrust them into the middle of Absalom while he was still alive in the middle of the oak tree. 18:15 Then ten soldiers who were Joab’s armor bearers struck Absalom and finished him off.