Sayyiduna Abu Dharr (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Clean earth is the ablution of a Muslim, even if he does not find water for ten years."
Makhlad alone narrated it in this way.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1021