Al-Kāfi

Hadith 1173
mockery-ridiculehellfire
9ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنِ ابْنِ مَحْبُوبٍ عَنِ ابْنِ رِئَابٍ عَنْ أَبِي عُبَيْدَةَ عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ الْبَذَاءُ مِنَ الْجَفَاءِ وَالْجَفَاءُ فِي النَّارِ.
9. A number of our people have narrated from Sahl ibn Ziyad from ibn Mahbub from ibn Ri’ab from abu ‘Ubaydah from Abu ‘Abdillah (a.s.) who has said the following: “Abu ‘Abd Allah (a.s.) has said, ‘Using foul language is injustice and injustice is in the fire.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī