Jami` at-Tirmidhi 2865

Narrated Abu Musa Al-Ash'ari:that the Messenger of Allah (ﷺ) narrated: "The parable of the believer who recites the Qur'an is that of a citron, its fragrance is nice and its taste is nice. The parable of the believer who does not recite the Qur'an is that of a date, it has no smell but its taste is sweet. The parable of the hypocrite who recites the Qur'an is that of basil, its fragrance is nice but its taste is bitter. The parable of the hypocrite who does not recite the Qur'an is that of the colocynth, its smell is better and its taste is bitter