Perform rituals of purification using alternative methods such as dust or sand when no access to water is available

This hadith explains how to perform Tayammum, a ritual of purification that is done when water is not available. It was narrated from Ibn 'Abdur-Rahman bin Abza, from his father, that a man asked 'Umar bin Al-Khattab about Tayammum and he did not know what to say. 'Ammar said that the Prophet Muhammad once told him that if he was on a campaign and became Junub but could not find any water to purify himself with then rolling in the dust would be sufficient. Shu'bah demonstrated this by striking his hands on his knees and blowing into them before wiping his face and palms with them once. This hadith teaches us that even if we do not have access to water for purifying ourselves we can still use dust or sand as an alternative method for performing our rituals of purification.