It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that once the Prophet (peace and blessings be upon him) came out of the house, relieved himself, and performed tayammum. I said, "O Messenger of Allah (peace and blessings be upon him)! Water is near you." The Prophet (peace and blessings be upon him) said: "How was I to know? Perhaps I would not be able to reach there."