What was the purpose of Anas Ibn Malik (peace be upon him) and the other boy accompanying the Prophet Muhammad (saw) whenever he went for answering the call of nature?
 Narrated Anas Ibn Malik:                     Whenever the Prophet went for answering the call of nature, I and another boy used to go after him with a staff, a stick or a short spear (or stick) and a tumbler of water and when he finished from answering the call of nature we would hand that tumbler of water to him.