'Water jug' in the Bible

However, because of the Lord, I will never lift my hand against the Lord’s anointed. Instead, take the spear and the water jug by his head, and let’s go.”

So David took the spear and the water jug by Saul’s head, and they went their way. No one saw them, no one knew, and no one woke up; they all remained asleep because a deep sleep from the Lord came over them.

What you have done is not good. As the Lord lives, all of you deserve to die since you didn’t protect your lord, the Lord’s anointed. Now look around; where are the king’s spear and water jug that were by his head?”