Abu Musa Al-Ash'ari said:"The Prophet [SAW] said: 'The parable of the believer who recites the Qur'an is that of a citron, the taste and smell of which are good. The parable of a believer who does not read the Qur'an is that of a date, the taste of which is good but it has no smell. The parable of a hypocrite who reads the Qur'an is that of basil, the smell of which is good but its taste is bitter. And the parable of a hypocrite who does not read the Qur'an is that of a colocynth (bitter-apple), the taste of which is bitter and it has no smell.'"
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ قَالَ حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ قَالَ حَدَّثَنَا سَعِيدٌ عَنْ قَتَادَةَ عَنْ أَنَسِ بْنِ مَالِكٍ أَنَّ أَبَا مُوسَى الْأَشْعَرِيَّ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَثَلُ الْمُؤْمِنِ الَّذِي يَقْرَأُ الْقُرْآنَ مَثَلُ الْأُتْرُجَّةِ طَعْمُهَا طَيِّبٌ وَرِيحُهَا طَيِّبٌ وَمَثَلُ الْمُؤْمِنِ الَّذِي لَا يَقْرَأُ الْقُرْآنَ كَمَثَلِ التَّمْرَةِ طَعْمُهَا طَيِّبٌ وَلَا رِيحَ لَهَا وَمَثَلُ الْمُنَافِقِ الَّذِي يَقْرَأُ الْقُرْآنَ كَمَثَلِ الرَّيْحَانَةِ رِيحُهَا طَيِّبٌ وَطَعْمُهَا مُرٌّ وَمَثَلُ الْمُنَافِقِ الَّذِي لَا يَقْرَأُ الْقُرْآنَ كَمَثَلِ الْحَنْظَلَةِ طَعْمُهَا مُرٌّ وَلَا رِيحَ لَهَا
Nesai
The Book Of Faith and its Signs • Hadith 5038