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 .