Clean earth is sufficient for a Muslim as a substitute for water for ablution (if he does not find water)

Sahih al-Bukhari · Book 7 · Hadith 344

حَدَّثَنَا مُسَدَّدٌ، قَالَ حَدَّثَنِي يَحْيَى بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا عَوْفٌ، قَالَ حَدَّثَنَا أَبُو رَجَاءٍ، عَنْ عِمْرَانَ، قَالَ كُنَّا فِي سَفَرٍ مَعَ النَّبِيِّ صلى الله عليه وسلم وَإِنَّا أَسْرَيْنَا، حَتَّى كُنَّا فِي آخِرِ اللَّيْلِ، وَقَعْنَا وَقْعَةً وَلاَ وَقْعَةَ أَحْلَى عِنْدَ الْمُسَافِرِ مِنْهَا، فَمَا أَيْقَظَنَا إِلاَّ حَرُّ الشَّمْس…

Narrated `Imran: Once we were traveling with the Prophet (ﷺ) and we carried on traveling till the last part of the night and then we (halted at a place) and slept (deeply). There is nothing sweeter than sleep for a trav…