Ablutions (Washing)

O believers, do not approach prayer while intoxicated until you understand what you say, nor when in a state of impurity, unless traveling, until you have bathed. If you are ill, on a journey, or have touched women and find no water, then perform dry ablution with clean earth, wiping your faces and hands.

4:43O ye who believe! Draw not near unto prayer when ye are drunken, till ye know that which ye utter, nor when ye are polluted, save when journeying upon the road, till ye have bathed. And if ye be ill, or on a journey, or one of you cometh from the closet, or ye have touched women, and ye find not water, then go to high clean soil and rub your faces and your hands (therewith). Lo! Allah is Benign, Forgiving.