It is narrated from Sayyidah Aishah (may Allah be pleased with her) that Suraqah bin Malik came to the Prophet (peace and blessings be upon him) and asked about relieving himself, and he ordered him "to keep himself upwind, to neither face the qiblah nor turn his back to it, and to clean himself with three stones in which there is no dung, or with three pieces of wood, or with three handfuls of earth."
(b) Imam Abu al-Hasan al-Daraqutni (may Allah have mercy on him) said that no one narrates this except Mubashshir bin Ubayd, and he is matruk al-hadith (abandoned in hadith). The Shaykh said: It is reported from Sayyiduna Anas bin Malik (may Allah be pleased with him) as a marfu' narration, and that is rejected.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 539