2 Samuel 18:5-9

And the king commanded Joab and Abishai and Ittai, saying, Deal gently for my sake with the young man, even with Absalom. And all the people heard when the king gave all the captains charge concerning Absalom. So the people went out into the field against Israel: and the battle was in the forest of Ephraim. And the people of Israel were smitten there before the servants of David, and there was a great slaughter there that day of twenty thousand men. For the battle was there spread over the face of all the country; and the forest devoured more people that day than the sword devoured. And Absalom chanced to meet the servants of David. And Absalom was riding upon his mule, and the mule went under the thick boughs of a great oak, and his head caught hold of the oak, and he was taken up between heaven and earth; and the mule that was under him went on.