Muwatta Malik 1642
موطأ مالك#1642SahihYahya related to me from Malik from Ibn Shihab from Salim ibn Abdullah from Abdullah ibn Umar that the Messenger of Allah, may Allah bless him and grant him peace, passed by a man who was chiding his brother about modesty. The Messenger of Allah, may Allah bless him and grant him peace, said, "Leave him. Modesty is part of iman
Scholarly Authentication
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Salim al-HilaliSahih
In-book reference: 47:10