Narrated Anas bin Malik (may Allah be pleased with him): Whenever the Prophet (peace and blessings of Allah be upon him) went out to relieve himself, I and a boy used to follow him, carrying a stick with a hook, or a staff, or a spear, and we had a water skin with us. When the Prophet (peace and blessings of Allah be upon him) finished relieving himself, we would hand him the water skin.