2 Samuel 15:12-13

12Absalom offered his sacrifices as he had promised to do. But at the same time he sent men to fetch Ahithophel from Giloh, where he lived. Ahithophel was King David's advisor. More and more people agreed to join Absalom and turn against David. So Absalom was becoming more powerful.

13Somebody brought this message to David: ‘The Israelites are now faithful to Absalom instead of you.’