Hadith on Khawarij: Rebels with good words, foolish dreams

Ali ibn Abi Talib reported: The Messenger of Allah, peace and blessings be upon him, said, “In the last days, there will appear young people with foolish dreams. They will say the best of words, but they will go out of Islam just as an arrow goes through its game. Their faith will not go beyond their throats.”

Source: Ṣaḥīḥ al-Bukhārī 4770, Ṣaḥīḥ Muslim 1066

Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim

عَنْ عَلِيٌ عَنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ يَأْتِي فِي آخِرِ الزَّمَانِ قَوْمٌ حُدَثَاءُ الْأَسْنَانِ سُفَهَاءُ الْأَحْلَامِ يَقُولُونَ مِنْ خَيْرِ قَوْلِ الْبَرِيَّةِ يَمْرُقُونَ مِنْ الْإِسْلَامِ كَمَا يَمْرُقُ السَّهْمُ مِنْ الرَّمِيَّةِ لَا يُجَاوِزُ إِيمَانُهُمْ حَنَاجِرَهُمْ

4770 صحيح البخاري كتاب فضائل القرآن باب إثم من راءى بقراءة القرآن أو تأكل به أو فخر به

1066 صحيح مسلم كتاب الزكاة باب التحريض على قتل الخوارج