An-Nisa

You who believe, do not come anywhere near the prayer if you are intoxicated, not until you know what you are saying; nor if you are in a state of major ritual impurity- though you may pass through the mosque- not until you have bathed; if you are ill, on a journey, have relieved yourselves, or had intercourse, and cannot find any water, then find some clean sand and wipe your faces and hands with it. God is always ready to pardon and forgive.