O you who believe! do not go near worship (salat) when you are intoxicated (not conscious) until you know what you say, nor when you have not taken a bath after sexual intercourse (or passing out of semen during sleep etc) until you have bathed, except when you are travelling on a road, and if you are sick or on a journey or one of you comes from the toilet or you have touched women, then (under the above circumstances if) you do not find water then take clean dust and wipe your faces and your hands, Allah is certainly Pardoning, Protectively Forgiving.
“This verse clearly indicates that we should know the meaning of what we recite while we offer Salat and that we should be neat and clean.”