Yahya related to me from Malik from Ibn Shihab from Salim ibn Abdullah from Abdullah ibn Umar that the Messenger of Allah ﷺ passed by a man who was chiding his brother about modesty. The Messenger of Allah ﷺ said, "Leave him. Modesty is part of iman."
أَنَّ رَسُولَ اللَّهِ ﷺ مَرَّ عَلَى رَجُلٍ وَهُوَ يَعِظُ أَخَاهُ فِي الْحَيَاءِ فَقَالَ رَسُولُ اللَّهِ ﷺ دَعْهُ فَإِنَّ الْحَيَاءَ مِنَ الإِيمَانِ