O you who have believed , do not approach prayer while you are intoxicated until you know what you are saying or in a state of janabah , except those passing through [ a place of prayer ] , until you have washed [ your whole body ] . And if you are ill or on a journey or one of you comes from the place of relieving himself or you have contacted women and find no water , then seek clean earth and wipe over your faces and your hands [ with it ] .