Mishkat al-Masabih
Mishkat al-Masabih 370
وَعَن سلمَان قَالَ قَالَ لَهُ بعض الْمُشْركين وَهُوَ يستهزئ بِهِ إِنِّي لأرى صَاحبكُم يعلمكم كل شَيْء حَتَّى الخراءة قَالَ أَجَلْ أَمَرَنَا أَنْ لَا نَسْتَقْبِلَ الْقِبْلَةَ وَلَا نَسْتَنْجِيَ بِأَيْمَانِنَا وَلَا نَكْتَفِيَ بِدُونِ ثَلَاثَةِ أَحْجَارٍ لَيْسَ فِيهَا رَجِيعٌ وَلَا عَظْمٌ. رَوَاهُ مُسْلِمٌ وَأحمد وَاللَّفْظ لَهُ
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Salmān said: ‘A polytheist mocked me, saying: “I see that your companion teaches you everything, even how to relieve yourselves!” I replied: “Yes. He has instructed us not to face the qibla, not to clean ourselves with our right hands, not to settle for fewer than three stones, and not to use dung or bone.”’ Muslim and Aḥmad transmitted it; Aḥmad’s is the wording given here.
Notes and open questions — unreviewed
The accompanying grading labels this report ṣaḥīḥ (sound). The source identifies the wording as Aḥmad’s, while also naming Muslim as a transmitter.