O you who believe! Approach not prayer while you are drunk (or mentally dull), until you know (can understand) what you are saying; nor yet while polluted - unless you are on a journey - until you have washed yourselves. But if you are sick, or on a journey, or one of you come from the toilet, or if you have touched a woman, and you cannot find water, then use clean sand (or earth) and wipe your faces and your hands therewith. Verily, Allah is Benign and Forgiving.