ghusl

in Islm, the `major ablution` that entails washing the entire body in ritually pure water and is required in specified cases for both the living and ...
Found on http://www.britannica.com/eb/a-z/g/29

Ghusl

Islam also recommends (i.e. it is mustahab) the performance of the full ablution before the Friday sermon prayer and Eid prayers, before entering the ehram, in preparation for hajj, after having lost consciousness, and after formally converting to Islam. Shia Muslims also perform the ablution before Namaz-e-tawbah. Ghusl should not be confused wit...
Found on http://en.wikipedia.org/wiki/Ghusl
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