2 Samuel 18:10-14

When a certain man saw him, he informed Joab and said, “Behold, I saw Absalom hanging in an oak.”

Then Joab said to the man who had informed him, “So behold, you saw him! Why then did you not strike him there to the ground? And it would have been my duty to give you ten pieces of silver and a belt.”

But the man said to Joab, “Even if I were to receive a thousand pieces of silver in my hand, I would not put out my hand against the king’s son; for in our hearing the king commanded you, Abishai, and Ittai, saying, ‘Protect the young man Absalom for me!’

Otherwise, if I had dealt treacherously against his life (and there is nothing hidden from the king), then you yourself would have avoided me.”

Then Joab said, “I will not waste time here with you.” So he took three spears in his hand and thrust them through the heart of Absalom while he was still alive in the midst of the oak.