Sahih Muslim | Book 1 | Hadith Number 109

Narrated by Abu Huraira
It is narrated on the authority of Abu Huraira: A fornicator who fornicates is not a believer as long as he commits fornication, and no one who steals is a believer as long as he commits theft, and no one who drinks wine is a believer as long as he drinks it, and repentance may be accepted after that.