Arabic text
عن عبد الله بن عمر رضي الله عنهما قال: سَمِعَ النَّبِيُّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ رَجُلًا يَعِظُ أَخَاهُ فِي الْحَيَاءِ، فَقَالَ: «الْحَيَاءُ مِنَ الْإِيمَانِ».
Translation
‘Abdullāh ibn ‘Umar (may Allah be pleased with him) reported: The Prophet (may Allah's peace and blessings be upon him) heard a man preaching to his brother about modesty; he said: "Modesty is part of faith."
Explanation
The Prophet (may Allah's peace and blessings be upon him) heard a man advising his brother to refrain from excessive modesty, and he clarified to him that modesty is part of faith and brings nothing but good. Modesty is a noble manner that prompts one to do what is good and refrain from detestable things.
Source: HadeethEnc.com