The Messenger of Allah ﷺ said, "Part of the excellence of a person's Islam is leaving alone what does not concern him."
حدثنا هشام بن عمار حدثنا محمد بن شعيب بن شابور حدثنا الأوزاعي عن قرة بن عبد الرحمن بن حيوئيل عن الزهري عن أبي سلمة
قال رسول الله ﷺ من حسن إسلام المرء تركه ما لا يعنيه
[Its chain is daif] Tirmidhi recorded it in the Book of Zuhd, chapter "The hadith that among the excellence of a person's Islam is his leaving what does not concern him," hadith no. 2317, from the hadith of Uzai, and he said, gharib. Baghawi also recorded it (Sharh al-Sunnah, 14/320, hadith no. 4132) with a sahih chain, from Uzai, "Qurra bin Abdul-Rahman bin Haywil narrated to me, Zuhri narrated to me, Abu Salama bin Abdul-Rahman narrated to me, Abu Hurairah narrated to me," and so on to the end. Nawawi graded it hasan in al-Arbain, and it has supporting evidence, though the majority of scholars declared Qurra daif.