Hazrat Imran bin Husain narrates that the Messenger of Allah, peace and blessings be upon him, led the people in prayer during a journey. He saw that a man was standing apart from the people in a corner. He asked, "Why did you not pray with the people?" He replied, "O Messenger of Allah! I became junub and did not find water." The Prophet, peace and blessings be upon him, said, "You could have performed tayammum with earth; that would have been sufficient for you."