Allah's Messenger (ﷺ) said, "When an adulterer commits illegal sexual intercourse, then he is not a believer at the time he is doing it; and when somebody drinks an alcoholic drink, then he is not believer at the time of drinking, and when a thief steals, he is not a believer at the time when he is stealing; and when a robber robs and the people look at him, then he is not a believer at the time of doing it." Abu Huraira in another narration, narrated the same from the Prophet (ﷺ) with the exclusion of robbery.
Reference: Sahih al-Bukhari 6772 In-book : Book 86, Hadith 1 USC-MSA web (English) : Vol. 8, Book 81, Hadith 763 (deprecated)
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