I heard the Prophet (ﷺ) ordering that an unmarried person guilty of illegal sexual intercourse be flogged one-hundred stripes and be exiled for one year. `Umar bin Al-Khattab also exiled such a person, and this tradition is still valid.
Reference: Sahih al-Bukhari 6831, 6832 In-book : Book 86, Hadith 58 USC-MSA web (English) : Vol. 8, Book 82, Hadith 818 (deprecated)
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