Yahya related to me from Malik from Ibn Shihab from Salim ibnAbdullah from Abdullah ibn Umar that the Messenger of Allah, may Allahbless him and grant him peace, passed by a man who was chiding hisbrother about modesty. The Messenger of Allah, may Allah bless him andgrant him peace, said, "Leave him. Modesty is part of iman."
USC-MSA web (English) reference: Book 47, Hadith 10
Arabic reference: Book 47, Hadith 1645