Quran 4:43

يَـٰٓأَيُّہَا ٱلَّذِينَ ءَامَنُواْ لَا تَقۡرَبُواْ ٱلصَّلَوٰةَ وَأَنتُمۡ سُكَـٰرَىٰ حَتَّىٰ تَعۡلَمُواْ مَا تَقُولُونَ وَلَا جُنُبًا إِلَّا عَابِرِى سَبِيلٍ حَتَّىٰ تَغۡتَسِلُواْ‌ۚ وَإِن كُنتُم مَّرۡضَىٰٓ أَوۡ عَلَىٰ سَفَرٍ أَوۡ جَآءَ أَحَدٌ۬ مِّنكُم مِّنَ ٱلۡغَآٮِٕطِ أَوۡ لَـٰمَسۡتُمُ ٱلنِّسَآءَ فَلَمۡ تَجِدُواْ مَآءً۬ فَتَيَمَّمُواْ صَعِيدً۬ا طَيِّبً۬ا فَٱمۡسَحُواْ بِوُجُوهِكُمۡ وَأَيۡدِيكُمۡ‌ۗ إِنَّ ٱللَّهَ كَانَ عَفُوًّا غَفُورًا ٤٣

O you who believe, do not observe the Salat (Contact Prayer) while intoxicated, so that you know what you are saying. Nor after sexual orgasm without bathing, unless you are on the road, traveling; if you are ill or traveling, or you had urinary or fecal-related excretion (such as gas), or contacted the women (sexually), and you cannot find water, you shall observe Tayammum (dry ablution) by touching clean dry soil, then wiping your faces and hands therewith. ALLAH is Pardoner, Forgiver.