2 Samuel 18:11-15

11And Joab said to the man that told him, And behold, thou sawest [him], and why didst thou not smite him there to the ground? and I would have given thee ten silver pieces and a girdle.

12And the man said to Joab, Though I should receive a thousand silver pieces in my hand, yet would I not put forth my hand against the king's son; for in our hearing the king charged thee and Abishai and Ittai, saying, Take care, whoever it be [of you], of the young man Absalom.

13Or I should have acted falsely against mine own life, for there is no matter concealed from the king, and thou wouldest have set thyself against [me].

14Then said Joab, I may not tarry thus with thee. And he took three spears in his hand, and thrust them into Absalom's body, while he was yet alive in the midst of the terebinth.

15And ten young men that bore Joab's armour surrounded and smote Absalom, and killed him.