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.  

قَالَ رَسُولُ اللَّهِ ﷺ 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 ﷺ  

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.  

سَمِعْتَ النَّبِيَّ ﷺ 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"  

وَقَالَ يَخْرُجُ مِنْهُ أَقْوَامٌ  

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

عَنِ النَّبِيِّ ﷺ قَالَ يَتِيهُ قَوْمٌ قِبَلَ الْمَشْرِقِ مُحَلَّقَةٌ رُءُوسُهُمْ