question #1 Sahih al-Bukhari 6810, Book 86, Hadith 39 : What is the relationship between committing major sins and one’s state of faith in Islam?

The Prophet (ﷺ) said, “The one who commits an illegal sexual intercourse is not a believer at the time of
committing illegal sexual intercourse and a thief is not a believer at the time of committing theft and a
drinker of alcoholic drink is not a believer at the time of drinking. Yet, (the gate of) repentance is open
thereafter.”