سورة An-Nisa ( The Women ) - الآية 43

O you who have faith! Do not approach prayer when you are intoxicated, [not] until you know what you are saying, nor [enter mosques] in the state of ritual impurity until you have washed yourselves, except while passing through. But if you are sick or on a journey, or any of you has come from the toilet, or you have touched women, and you cannot find water, then make your ablution on clean ground and wipe a part of your faces and your hands. Indeed Allah is all-excusing, all-forgiving.