It is narrated from Sayyiduna Abdur Rahman bin Abzi (may Allah be pleased with him) that a man came to Sayyiduna Umar bin Khattab (may Allah be pleased with him) and said, "I have become junub (in a state of major ritual impurity) and I have not found water (so what should I do?)" Sayyiduna Umar (may Allah be pleased with him) said, "Do not pray (rather wait until you find water)." Then Sayyiduna Ammar (may Allah be pleased with him) said, "O Commander of the Faithful, do you not remember when you and I were in a military expedition and we both became junub and did not find water? So you did not pray, while I rolled in the earth and then prayed. Then when we came to the Prophet (peace and blessings be upon him), I mentioned this incident to him. So the Prophet (peace and blessings be upon him) said: 'It would have been sufficient for you to do this.' And the Prophet (peace and blessings be upon him) struck his hand on the earth, then blew on it, and wiped his face and both hands with it."