"The Messenger of Allah ﷺ said: 'Clean earth is the Wudu' of the Muslim, even if he does not find water for ten years.'"  

قَالَ رَسُولُ اللَّهِ ﷺ الصَّعِيدُ الطَّيِّبُ وَضُوءُ الْمُسْلِمِ وَإِنْ لَمْ يَجِدِ الْمَاءَ عَشْرَ سِنِينَ