The Messenger of Allah ﷺ said, "Part of a person's excellence in Islam is leaving alone what does not concern him."
قال رسول الله ﷺ: إن من حسن إسلام المرء تركه ما لا يعنيه.
Tirmidhi (2317), Ibn Majah (3976), and Ibn Hibban in his Sahih (229) all narrated it through the route of Uzai, from Qurra bin Abdul-Rahman, from Zuhri, from Abu Salama, from Abu Hurairah, and he related the hadith. Tirmidhi said, "This is a gharib hadith, we do not know it except through the hadith of Abu Salama, from Abu Hurairah, from the Prophet ﷺ, and only through this route."I say, its isnad is hasan because of Qurra bin Abdul-Rahman, for most scholars have graded him daif and said, "There is nakarah in his hadith." But Ibn Adi, after narrating the aforementioned hadith through the route of Uzai, said, "It has been narrated from Uzai, from Qurra, from Zuhri, more than a dozen hadiths, and Qurra has sound hadiths narrated from him by Rushdin, Suwayd bin Abdul-Aziz, Ibn Wahb, Uzai, and others, and the sum of his hadith as transmitted by these narrators, I have not seen among his hadiths one that is severely munkar so that I would mention it, and I hope that there is no harm in him." End of quote. Ibn Hibban mentioned him in "Thiqat," and included his hadith in his Sahih, and Ajli said, "His hadith is to be written down."I say, what Ibn Adi has said here is evident in this hadith, that is, there is no nakarah in it, rather the sahih hadiths bear witness to it in meaning. Hafiz Mizzi transmitted, in his biographical entry on Abu Dawud the author of the Sunan, that he said, "I wrote down from the Messenger of Allah five hundred thousand hadiths, from which I selected what I included in this book, meaning the Sunan, gathering in it four thousand eight hundred hadiths. I mentioned the sahih and what resembles and approximates it, and it suffices a person for his religion to have four hadiths from it..." and among those he mentioned was this hadith.