Islamic teachings forbid extravagance, and extravagance refers to anything that is surplus to a person’s requirements, even with regard to using water for ghusl or wudu’. In this hadith, Anas ibn Malik (may Allah be pleased with him) tells us that the Prophet (blessings and peace of Allah be upon him) used to do ghusl using a sa‘ or five mudds, and he would do wudu’ with one mudd. The sa‘ is a unit of measurement equivalent to four mudds or eight ratls. In modern terms, it is said that the ratl is equivalent to approximately 380 grams, or less than half a litre; or it is said that it is equivalent to 538 grams, or more than half a litre. The mudd is equivalent to one quarter of a sa‘ or, it was said, it is equivalent to one and a third ratls, or two ratls. It is the amount of water that may be held in the joined palms of both hands. This report tells us how much water was sufficient for the Prophet (blessings and peace of Allah be upon him), not that it is not permissible to use more than that. Rather people vary in that regard; some people cannot do wudu’ and ghusl properly except with more than that, but whatever the case, it is essential to avoid being extravagant with water. This comes under the heading of proper use of resources and making the best use of them by disposing of them properly, and using only is much as is needed..