2 Samuel 15:12

15:12 While he was offering sacrifices, Absalom sent for Ahithophel the Gilonite, David’s adviser, to come from his city, Giloh. The conspiracy was gaining momentum, and the people were starting to side with Absalom.

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!”