The Book of Faith
1/12. Chapter:
Clarifying the number of branches of faith, the best and the least of them, the virtue of modesty (Al-Haya') and the fact that it is part of faith
Sahih Muslim
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَعَمْرٌو النَّاقِدُ، وَزُهَيْرُ بْنُ حَرْبٍ، قَالُوا حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنِ الزُّهْرِيِّ، عَنْ سَالِمٍ، عَنْ أَبِيهِ، سَمِعَ النَّبِيُّ صلى الله عليه وسلم رَجُلاً يَعِظُ أَخَاهُ فِي الْحَيَاءِ فَقَالَ " الْحَيَاءُ مِنَ الإِيمَانِ " .
Salim reported on the authority of his father that the Prophet (may peace and blessings be upon him) heard a man censuring his brother regarding modesty. Upon this the Prophet remarked: Modesty is part of Iman (faith).
Reference : Sahih Muslim 36aIn-book reference : Book 1, Hadith 61USC-MSA web (English) reference : Book 1, Hadith 57