Sahih Muslim Book 4, Hadith Number 1748.

Chapter : Excellence of the one who is proficient in the Qur’an and one who falters in it.

Anas reported Allah’s Messenger (may peace be upon him) as saying to Ubayy b. Ka’b: Aliah has commanded me to recite to you: “Those who disbelieve were not…” (Al-Qur’an, xcviii. 1). He said: Did He mention me by name? He (the Holy Prophet said): Yes. Upon this he shed tears (of gratitude).