2 Samuel 17:21-23

²¹After Absalom's officers left, the two men climbed out of the well and rushed off to give the king their message. “Have everybody get up and cross the river right away, for Ahithophel's advice is to attack you immediately.”

²²David and everybody with him got up and crossed the Jordan. By the time it got light there wasn't anybody who hadn't crossed over.

²³When Ahithophel realized that his advice had been ignored, he saddled up his donkey and left for his home in the town where he lived. He put his affairs in order and then he hanged himself. He died and was buried in his father's tomb.