It is narrated from Sayyiduna Sahl that once the Prophet (peace and blessings be upon him) sent him and said: "You are my envoy to the people of Makkah. Go and convey this message to them: The Prophet (peace and blessings be upon him) has sent me to you, he sends you greetings of peace, and he commands you with three things: Do not swear by anyone other than Allah; when relieving yourselves, do not face or turn your back to the Qiblah; and do not use bones or dung for istinja (cleaning after relieving oneself)."
Hadith Referenceمسند احمد / مسند المكيين / 15984
Hadith Gradingحکم دارالسلام:ماورد فيه من نهي صحيح، وهذا اسناد ضيعف لضعف عبدالكريم، ولجهالة الوليد بن مالك، ومحمد بن قيس