Bulugh al-Maram, Book 16, Hadith 1567 (English)

Ibn 'Umar (RAA) narrated that the Messenger of Allah said: “Haya (modesty, bashfulness etc.) is a part of Faith.” Agreed upon.

وَعَنِ اِبْنِ عُمَرَ ‏-رَضِيَ اَللَّهُ عَنْهُمَا‏- قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ اَلْحَيَاءُ مِنْ اَلْإِيمَانِ } مُتَّفَقٌ عَلَيْهِ.‏ (1986)‏.‏ ‏3 ‏- صحيح.‏ رواه البخاري (24)‏، ومسلم (36)‏.‏

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also referenced under: Book 16, Hadith 1524 (In-Book)