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."
Reference: Sahih al-Bukhari 6810 In-book : Book 86, Hadith 40 USC-MSA web (English) : Vol. 8, Book 82, Hadith 801 (deprecated)
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