2 Samuel 18:11-13

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].