2 Samuel 15:34

but if thou return to the city and say unto Absalom, I will be thy servant, O king; as I have been thy father's servant hitherto, in the capacity of private counselor, 2 Samuel 16:16; 1 Chronicles 27:33, so will I now also be thy servant, then mayest thou for me, in the interest of David, defeat the counsel of Ahithophel. In this way Hushai could be of assistance in defeating the insurrection and restoring the rightful king to the throne.