2 Samuel 18:11-13

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

12And the man said unto Joab, Though I should receive a thousand pieces of silver in mine hand, yet would I not put forth mine hand against the king’s son: for in our hearing the king charged thee and Abishai and Ittai, saying, Beware that none touch the young man Absalom.

13Otherwise if I had dealt falsely against his life, (and there is no matter hid from the king,) then thou thyself wouldest have stood aloof.