Alqamah narrates: A man from among the polytheists said to Sayyiduna Abdullah (may Allah be pleased with him): I think that your master has taught you everything, so much so that he has even taught you how you should go to relieve yourselves! Sayyiduna Abdullah (may Allah be pleased with him) said: If you are mocking (then let me tell you), he taught us that we should not turn our private parts towards the qiblah. The narrator says: I think he also said: and that we should not cleanse ourselves (istinja) with our right hands, nor cleanse ourselves with dung, nor cleanse ourselves with bone, nor cleanse ourselves with fewer than three stones.
Al-Bazzar recorded it, and its narrators have been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطهارة / 1005