وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ عَلِيِّ بْنِ حُسَيْنِ بْنِ عَلِيِّ بْنِ أَبِي طَالِبٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ مِنْ حُسْنِ إِسْلاَمِ الْمَرْءِ تَرْكُهُ مَا لاَ يَعْنِيهِ ‏"‏ ‏.‏

Yahya related to me from Malik from Ibn Shihab from Ali ibnHusayn ibn Ali ibn Abi Talib that the Messenger of Allah, may Allahbless him and grant him peace, said, "Part of the excellence of aman's Islam is that he leaves what does not concern him." Translation Not Available

Book reference: Muwatta Imam Malik Book 47 Hadith 1638
Web reference: Muwatta Imam Malik Book 47 Hadith 3