Narrated Abu Musa (رضي الله عنه) : The Prophet (صلّى الله عليه وسلّم ) said,

“The example of a believer who recites the Qur’an and acts on it, is like a citron which tastes nice and smells nice.

And the example of a believer who does not recite the Qur’an but acts on it, is like a date which tastes good but has no smell.

And the example of a hypocrite who recites the Qur’an is like a Raihdna (sweet basil) which smells good but tastes bitter.

And the example of a hypocrite who does not recite the Qur’an is like a colocynth which tastes bitter and has a bad smell.”

Source: Saheeh al-Bukhari, Translated by Dr. Muhammad Muhsin Khan