Sahih Bukhari
Sahih Bukhari Volume 006, Book 061, Hadith Number 581.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 61. Virtues of The Qur'an
Narrated By Jundub : The Prophet said, "Recite (and study) the Quran as long as you agree about its interpretation, but when you have any difference of opinion (as regards its interpretation and meaning) then you should stop reciting it (for the time being)."