2 Samuel 18:5-9

The king charged Joab and Abishai and Ittai, saying, “Deal gently for my sake with the young man Absalom.” And all the people heard when the king charged all the commanders concerning Absalom. Then the people went out into the field against Israel, and the battle took place in the forest of Ephraim. The people of Israel were defeated there before the servants of David, and the slaughter there that day was great, 20,000 men. For the battle there was spread over the whole countryside, and the forest devoured more people that day than the sword devoured. Now Absalom happened to meet the servants of David. For Absalom was riding on his mule, and the mule went under the thick branches of a great oak. And his head caught fast in the oak, so he was left hanging between heaven and earth, while the mule that was under him kept going.