2 Samuel 15:31

15:31 Now David had been told, “Ahithophel has sided with the conspirators who are with Absalom. So David prayed, “Make the advice of Ahithophel foolish, O Lord!”

2 Samuel 15:34

15:34 But you will be able to counter the advice of Ahithophel if you go back to the city and say to Absalom, ‘I will be your servant, O king! Previously I was your father’s servant, and now I will be your servant.’