Approach not As-Salat ( the prayer ) when you are in a drunken state until you know ( the meaning ) of what you utter , nor when you are in a state of Janaba , ( i.e. in a state of sexual impurity and have not yet taken a bath ) except when travelling on the road ( without enough water , or just passing through a mosque ) , till you wash your whole body . And if you are ill , or on a journey , or one of you comes after answering the call of nature , or you have been in contact with women ( by sexual relations ) and you find no water , perform Tayammum with clean earth and rub therewith your faces and hands ( Tayammum ) .