Abu Musa Al-Ash'ari Radiyallahu 'anhu narrates that Rasullullah Sallallahu 'alaihi wasallam said: The example of a Mu'min who recites the Qur'an is like the citron, its fragrance is pleasing and its taste is good; and the example of a Mu'min who does not recite the Qur'an is like a date, which has no fragrance but its taste is sweet. And the example of a hypocrite who recites the Qur'an is like a flower, its fragrance is good, but its taste is bitter; and the example of a hypocrite who does not recite the Qur'an is like colocynth, which has no fragrance, and its taste is bitter. (Muslim: 1860)
Note: Colocynth is a fruit similar to melon in appearance.