The sin of the person who recites the Qur‘an to show off or to gain some worldly benefit, or to feel proud etc.

Narrated 'Ali:

I heard the Prophet saying, "In the last days (of the world) there will appear young people with foolish thoughts and ideas. They will give good talks, but they will go out of Islam as an arrow goes out of its game, their faith will not exceed their throats. So, wherever you find them, kill them, for there will be a reward for their killers on the Day of Resurrection."

حَدَّثَنَا مُحَمَّدُ بْنُ كَثِيرٍ، أَخْبَرَنَا سُفْيَانُ، حَدَّثَنَا الأَعْمَشُ، عَنْ خَيْثَمَةَ، عَنْ سُوَيْدِ بْنِ غَفَلَةَ، قَالَ عَلِيٌّ رضى الله عنه سَمِعْتُ النَّبِيَّ ﷺ يَقُولُ " يَأْتِي فِي آخِرِ الزَّمَانِ قَوْمٌ حُدَثَاءُ الأَسْنَانِ، سُفَهَاءُ الأَحْلاَمِ، يَقُولُونَ مِنْ خَيْرِ قَوْلِ الْبَرِيَّةِ، يَمْرُقُونَ مِنَ الإِسْلاَمِ كَمَا يَمْرُقُ السَّهْمُ مِنَ الرَّمِيَّةِ، لاَ يُجَاوِزُ إِيمَانُهُمْ حَنَاجِرَهُمْ، فَأَيْنَمَا لَقِيتُمُوهُمْ فَاقْتُلُوهُمْ، فَإِنَّ قَتْلَهُمْ أَجْرٌ لِمَنْ قَتَلَهُمْ يَوْمَ الْقِيَامَةِ ".

Narrated Abu Said Al-Khudri:

I heard Allah's Apostle saying, "There will appear some people among you whose prayer will make you look down upon yours, and whose fasting will make you look down upon yours, but they will recite the Qur'an which will not exceed their throats (they will not act on it) and they will go out of Islam as an arrow goes out through the game whereupon the archer would examine the arrowhead but see nothing, and look at the unfeathered arrow but see nothing, and look at the arrow feathers but see nothing, and finally he suspects to find something in the lower part of the arrow."

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ مُحَمَّدِ بْنِ إِبْرَاهِيمَ بْنِ الْحَارِثِ التَّيْمِيِّ، عَنْ أَبِي سَلَمَةَ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ ـ رضى الله عنه ـ أَنَّهُ قَالَ سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ " يَخْرُجُ فِيكُمْ قَوْمٌ تَحْقِرُونَ صَلاَتَكُمْ مَعَ صَلاَتِهِمْ، وَصِيَامَكُمْ مَعَ صِيَامِهِمْ، وَعَمَلَكُمْ مَعَ عَمَلِهِمْ، وَيَقْرَءُونَ الْقُرْآنَ لاَ يُجَاوِزُ حَنَاجِرَهُمْ، يَمْرُقُونَ مِنَ الدِّينَ كَمَا يَمْرُقُ السَّهْمُ مِنَ الرَّمِيَّةِ، يَنْظُرُ فِي النَّصْلِ فَلاَ يَرَى شَيْئًا، وَيَنْظُرُ فِي الْقِدْحِ فَلاَ يَرَى شَيْئًا، وَيَنْظُرُ فِي الرِّيشِ فَلاَ يَرَى شَيْئًا، وَيَتَمَارَى فِي الْفُوقِ ".