The Messenger of Allah [SAW] passed by a man who was censuring his brother about modesty. He said: "Let him be, for modesty is part of faith."  

أَنَّ رَسُولَ اللَّهِ ﷺ مَرَّ عَلَى رَجُلٍ يَعِظُ أَخَاهُ فِي الْحَيَاءِ فَقَالَ دَعْهُ فَإِنَّ الْحَيَاءَ مِنْ الْإِيمَانِ