Sahih Bukhari
Virtues and Merits of the Prophet (pbuh) and his Companions
Volume: 004 / Book Number: 056 / Hadith Number: 733
Narrated Abu Huraira:
Allah's Apostle said, "Doesn't it astonish you how Allah protects me from the Quraish's abusing and cursing? They abuse Mudhammam and curse Mudhammam while I am Muhammad (and not Mudhammam)"