2 Samuel 15:32-34

Now when David had come to the top of the slope, where they gave worship to God, Hushai the Archite came to him in great grief with dust on his head: David said to him, If you go on with me, you will be a trouble to me: But if you go back to the town and say to Absalom, I will be your servant, O king; as in the past I have been your father's servant, so now I will be yours: then you will be able to keep Ahithophel's designs against me from being put into effect.