2 Samuel 11:14-17

So the next morning David wrote a letter to Joab and gave it to Uriah to deliver. The letter instructed Joab, “Station Uriah on the front lines where the battle is fiercest. Then pull back so that he will be killed.” So Joab assigned Uriah to a spot close to the city wall where he knew the enemy’s strongest men were fighting. And when the enemy soldiers came out of the city to fight, Uriah the Hittite was killed along with several other Israelite soldiers.