Narrated Abu Musa:
The Prophet (pbuh) 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 Raihana (sweet basil), which smells good but tastes bitter. And the example of a hypocrite who does not recite the Quran is like a colocynth, which tastes bitter and has a bad smell."
(Sahih Bukhari, Volume 6, Book 61, Number 579; also, Number 538)