Muwatta Malik 1635
موطأ مالك#1635HasanYahya related to me from Malik from Ibn Shihab from Ali ibn Husayn ibn Ali ibn Abi Talib that the Messenger of Allah, may Allah bless him and grant him peace, said, "Part of the excellence of a man's Islam is that he leaves what does not concern him
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliHasan
In-book reference: 47:3