Sunan an-Nasa'i 4871
سنن النسائي#4871SahihIt was narrated from abu Hurairah that the Prophet - and Ahmad said in his Hadith:"The Messenger of Allah said: 'No one who commits Zina is a believer at the moment when he is committing Zina; no one who steals is a believer at the moment when he is stealing; no one who drinks wine is a believer at the moment when he is drinking it; but repentance is available to him after that
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 46:2