Sahih Muslim Book 4, Hadith Number 1754.

Chapter : Excellence of the reciting of the Qur’an by one who is more skilled and proficient before one who is inferior to him.

This Hadith has been narrated by A’mash with the same chain of transmitters but with an exception that it is not mentioned in it: “He said to me: You recited (the Qur’an) well.”