Abu Juhaim bin Harith Al-Ansari (may Allah be pleased with him) said that the Prophet Muhammad (peace and blessings be upon him) came from the direction of Bi’r Jamal, and a man (Abu Juhaim himself) met him and greeted him with Salam. But the Prophet (peace and blessings be upon him) did not reply to him until he came to a wall, struck it with his hand, wiped his face and hands, and then replied to the greeting.