Sahih Bukhari Volume 001, Book 003, Hadith Number 110.
Narated By Abu Huraira : The Prophet said, "Name yourselves with my name (use my name) but do not name yourselves with my Kunya name (i.e. Abu-l Qasim). And whoever sees me in a dream then surely he has seen me for Satan cannot impersonate me. And whoever tells a lie against me (intentionally), then (surely) let him occupy his seat in Hell-fire."