"The Messenger of Allah said: 'For cleaning yourself you need three stones, no one of them being dung.'"
Sunan Ibn Majah Book 1, Hadith 49
← Previous Hadith "The Messenger of Allah went to the toilet and said: 'Bring me three stones.' So I brought him two stones and a piece of dung. He took the two stones and threw the dung away, saying: 'It is impure.'"

Sunan Ibn Majah Book 1, Hadith 48 Next Hadith → "I see that your companion (the Prophet) is teaching you everything, even how to relieve yourselves?" He said: "Yes indeed. He has ordered us not to face the Qiblah (prayer direction) nor to clean ourselves with our right hands, and not to be content with anything less than three stones, which are not to include any excrement or bones."

Sunan Ibn Majah Book 1, Hadith 50