It was narrated that Abu Dharr said:
"The Messenger of Allah (ﷺ) said: 'Clean earth is the Wudu' of the Muslim, even if he does not find water for ten years.'" (ES)
English reference (ES): Vol. 1, Book 1, Hadith 323 (ES)
Arabic reference (ES): Book 1, Hadith 324 (ES)