Al-Adab Al-Mufrad
Book 56, Hadith 10
حَدَّثَنَا سَعِيدُ بْنُ سُلَيْمَانَ، قَالَ: حَدَّثَنَا هُشَيْمٌ، عَنْ مَنْصُورٍ، عَنِ الْحَسَنِ، عَنْ أَبِي بَكْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ: الْحَيَاءُ مِنَ الإِيمَانِ، وَالإِيمَانُ فِي الْجَنَّةِ، وَالْبَذَاءُ مِنَ الْجَفَاءِ، وَالْجَفَاءُ فِي النَّارِ.
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Sa‘id ibn Sulayman related to us: Hushaim related to us, from Mansur, from al-Hasan, from Abu Bakrah, from the Prophet, Allah bless him and grant him peace, who said: ‘Modesty is part of faith, and faith is in the Garden. Foul speech is part of coarseness, and coarseness is in the Fire.’
Notes and open questions — unreviewed
The Arabic contrasts haya’ (modesty) with badha’ (foul or obscene speech) and jafa’ (coarseness/roughness).