It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that a Bedouin came to the service of the Holy Prophet (peace and blessings be upon him) and said, "O Messenger of Allah! I stay continuously in desert areas for four or five months. Among us are women in menstruation and postnatal bleeding, and men in a state of major ritual impurity (janabah), (but) we do not find water. So what is your opinion?" The Holy Prophet (peace and blessings be upon him) said, "Make the earth (dust) obligatory upon yourselves."