2 Samuel 17:22-24

22So David and all the people who were with him got up and crossed the Jordan River. By dawn there was not one person left who had not crossed the Jordan.

23When Ahithophel realized that his advice had not been followed, he saddled his donkey and returned to his house in his hometown. After setting his household in order, he hanged himself. So he died and was buried in the grave of his father.

24Meanwhile David had gone to Mahanaim, while Absalom and all the men of Israel had crossed the Jordan River.