Mishkat al-Masabih 27 Fitan كتاب الفتن 23

وَعَنْ عَبْدِاللَّهِ بْنِ عَمْرٍو قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «سَتَكُونُ فِتْنَةٌ تَسْتَنْظِفُ الْعَرَبَ قَتْلَاهَا فِي النَّارِ اللِّسَانُ فِيهَا أَشَدُّ مِنْ وَقْعِ السَّيْفِ» . رَوَاهُ التِّرْمِذِيُّ وَابْن مَاجَه

`Abdallah b. `Amr reported God’s messenger as saying, “There will be civil strife which will wipe out the Arabs, and their slain will go to hell. During it the tongue will be more severe than blows of the sword.” Tirmidhi and Ibn Majah transmitted it.