"‏ مَثَلُ الْمُؤْمِنِ الَّذِي يَقْرَأُ الْقُرْآنَ مَثَلُ الأُتْرُجَّةِ رِيحُهَا طَيِّبٌ وَطَعْمُهَا طَيِّبٌ وَمَثَلُ الْمُؤْمِنِ الَّذِي لاَ يَقْرَأُ الْقُرْآنَ كَمَثَلِ التَّمْرَةِ طَعْمُهَا طَيِّبٌ وَلاَ رِيحَ لَهَا وَمَثَلُ الْفَاجِرِ الَّذِي يَقْرَأُ الْقُرْآنَ كَمَثَلِ الرَّيْحَانَةِ رِيحُهَا طَيِّبٌ وَطَعْمُهَا مُرٌّ وَمَثَلُ الْفَاجِرِ الَّذِي لاَ يَقْرَأُ الْقُرْآنَ كَمَثَلِ الْحَنْظَلَةِ طَعْمُهَا مُرٌّ وَلاَ رِيحَ لَهَا وَمَثَلُ الْجَلِيسِ الصَّالِحِ كَمَثَلِ صَاحِبِ الْمِسْكِ إِنْ لَمْ يُصِبْكَ مِنْهُ شَىْءٌ أَصَابَكَ مِنْ رِيحِهِ وَمَثَلُ جَلِيسِ السُّوءِ كَمَثَلِ صَاحِبِ الْكِيرِ إِنْ لَمْ يُصِبْكَ مِنْ سَوَادِهِ أَصَابَكَ مِنْ دُخَانِهِ ‏"

The Prophet (ﷺ) said: A believer who recites the Qur'an is like a citron whose fragrance is sweet and whose taste is sweet, a believer who does not recite the Qur'an is like a date which has no fragrance but has sweet taste, a profligate who recites the Qur'an is like basil whose fragrance is sweet but whose taste is bitter, and the profligate who does not recite the Qur'an is like the colocynth which has a bitter taste and has not fragrance. A good companion is like a man who has musk; if nothing of it goes to you, its fragrance will (certainly) go to you; and a bad companion is like a man who has bellows; if its (black) root does not go to you, its smoke will (certainly) go to you.