Al-Ma'idah 5:6 يا ايها الذين امنوا اذا قمتم الى الصلاة فاغسلوا وجوهكم وايديكم الى المرافق وامسحوا برءوسكم وارجلكم الى الكعبين وان كنتم جنبا فاطهروا وان كنتم مرضى او على سفر او جاء احد منكم من الغايط او لامستم النساء فلم تجدوا ماء فتيمموا صعيدا طيبا فامسحوا بوجوهكم وايديكم منه ما يريد الله ليجعل عليكم من حرج ولاكن يريد ليطهركم وليتم نعمته عليكم لعلكم تشكرون ٦

O you who believe! When you intend to offer As-Salât (the prayer), wash your faces and your hands (forearms) up to the elbows, rub (by passing wet hands over) your heads, and (wash) your feet up to ankles¹. If you are in a state of Janâba (i.e. after a sexual discharge), purify yourselves (bathe your whole body). But if you are ill or on a journey, or any of you comes after answering the call of nature, or you have been in contact with women (i.e. sexual intercourse), and you find no water, then perform Tayammum with clean earth and rub therewith your faces and hands.² Allâh does not want to place you in difficulty, but He wants to purify you, and to complete His Favour to you that you may be thankful.