Sayyiduna Abu Dharr (may Allah be pleased with him) narrates: Some goats were gathered with the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) said: "O Abu Dharr, go out with them (to the pasture)." So I went out to al-Rabadhah. There I would become junub and would spend five or six days in that state. Then I came to the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) said: "Abu Dharr!" I remained silent. He (peace and blessings be upon him) said: "May your mother lose you, woe to your mother!" Then he (peace and blessings be upon him) called a slave girl, who brought a large vessel of water. She screened me with a cloth, and I screened myself behind the mount and took a ritual bath, and I felt as though a mountain had been lifted off me. Then he (peace and blessings be upon him) said: "Clean earth is the ablution of a Muslim, even if (he finds no water) for ten years. When you find water, let it touch your skin (that is, perform ghusl or ablution), for that is better." This hadith is sahih (authentic), but only Abu Qilabah narrated it from Amr bin Bujdan, and this is in line with my principle, as the two Shaykhs have taken such narrations.