O ye true believers, come not to prayer when ye are drunken, but wait till ye can understand what ye utter; nor when ye are polluted, unless ye be travelling on the road, until ye have washed you. If ye be sick, or on a journey, or have come from the unclean place, or have touched a woman, and ye find not water, then rub pure sand, and bathe your face and your hands with it: verily, God is Lenient, Merciful.