The Khawarij are the most evil of people and of all creation

Abu Dharr reported Allah's Messenger (ﷺ) as saying:

Verily there would arise from my Ummah after me or soon after me a group (of people) who would recite the Qur'an, but it would not go beyond their throats, and they would pass clean through their religion just as the arrow passes through the prey, and they would never come back to it. They would be the worst among the creation and the creatures. Ibn Samit (one of the narrators) said: I met Rafi' b. 'Amr Ghifari, the brother of Al-Hakam Ghifari and I said: What is this hadith that I heard from Abu Dharr, i. e. so and so? and then I narrated that hadith to him and said: I heard it from the Messenger of Allah (ﷺ).

حَدَّثَنَا شَيْبَانُ بْنُ فَرُّوخَ، حَدَّثَنَا سُلَيْمَانُ بْنُ الْمُغِيرَةِ، حَدَّثَنَا حُمَيْدُ بْنُ هِلاَلٍ، عَنْ عَبْدِ اللَّهِ بْنِ الصَّامِتِ، عَنْ أَبِي ذَرٍّ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏

‏ إِنَّ بَعْدِي مِنْ أُمَّتِي - أَوْ سَيَكُونُ بَعْدِي مِنْ أُمَّتِي - قَوْمٌ يَقْرَءُونَ الْقُرْآنَ لاَ يُجَاوِزُ حَلاَقِيمَهُمْ يَخْرُجُونَ مِنَ الدِّينِ كَمَا يَخْرُجُ السَّهْمُ مِنَ الرَّمِيَّةِ ثُمَّ لاَ يَعُودُونَ فِيهِ هُمْ شَرُّ الْخَلْقِ وَالْخَلِيقَةِ ‏

‏ ‏.‏ فَقَالَ ابْنُ الصَّامِتِ فَلَقِيتُ رَافِعَ بْنَ عَمْرٍو الْغِفَارِيَّ أَخَا الْحَكَمِ الْغِفَارِيِّ قُلْتُ مَا حَدِيثٌ سَمِعْتُهُ مِنْ أَبِي ذَرٍّ كَذَا وَكَذَا فَذَكَرْتُ لَهُ هَذَا الْحَدِيثَ فَقَالَ وَأَنَا سَمِعْتُهُ مِنْ رَسُولِ اللَّهِ صلى الله عليه وسلم ‏.‏

Yusair b. 'Amr reported that he inquired of Sahl b. Hunaif:

Did you hear the Messenger of Allah (ﷺ) making a mention of the Khawarij? He said: I heard him say (and he pointed with his hand towards the east) that these would be a people who would recite the Qur'an with their tongues and it would not go beyond their collar bones. They would pass clean through their religion just as the arrow passes through the prey.

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَلِيُّ بْنُ مُسْهِرٍ، عَنِ الشَّيْبَانِيِّ، عَنْ يُسَيْرِ بْنِ، عَمْرٍو قَالَ سَأَلْتُ سَهْلَ بْنَ حُنَيْفٍ هَلْ سَمِعْتَ النَّبِيَّ صلى الله عليه وسلم يَذْكُرُ الْخَوَارِجَ فَقَالَ سَمِعْتُهُ - وَأَشَارَ بِيَدِهِ نَحْوَ الْمَشْرِقِ ‏

‏ قَوْمٌ يَقْرَءُونَ الْقُرْآنَ بِأَلْسِنَتِهِمْ لاَ يَعْدُو تَرَاقِيَهُمْ يَمْرُقُونَ مِنَ الدِّينِ كَمَا يَمْرُقُ السَّهْمُ مِنَ الرَّمِيَّةِ ‏

‏ ‏.‏

This hadith had been transmitted by Sulaiman Shaibani with the same chain of narrators (and the words are)," There would arise out of (this group) many a group"

وَحَدَّثَنَاهُ أَبُو كَامِلٍ، حَدَّثَنَا عَبْدُ الْوَاحِدِ، حَدَّثَنَا سُلَيْمَانُ الشَّيْبَانِيُّ، بِهَذَا الإِسْنَادِ وَقَالَ يَخْرُجُ مِنْهُ أَقْوَامٌ ‏.‏

Sahl b. Hunaif reported Allah's Messenger (ﷺ) as saying:

There would arise from the east a people with shaven heads.

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَإِسْحَاقُ، جَمِيعًا عَنْ يَزِيدَ، - قَالَ أَبُو بَكْرٍ حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، - عَنِ الْعَوَّامِ بْنِ حَوْشَبٍ، حَدَّثَنَا أَبُو إِسْحَاقَ الشَّيْبَانِيُّ، عَنْ أُسَيْرِ بْنِ عَمْرٍو، عَنْ سَهْلِ بْنِ حُنَيْفٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏

‏ يَتِيهُ قَوْمٌ قِبَلَ الْمَشْرِقِ مُحَلَّقَةٌ رُءُوسُهُمْ ‏

‏ ‏.‏