that Allah's Messenger (ﷺ) was asked about an unmarried slave-girl who committed illegal sexual intercourse. They heard him saying, "Flog her, and if she commits illegal sexual intercourse after that, flog her again, and on the third (or the fourth) offense, sell her."
Sahih al-Bukhari Book 34, Hadith 179
← Previous Hadith Allah's Messenger (ﷺ) sold a Mudabbar.

Sahih al-Bukhari Book 34, Hadith 178 Next Hadith → I heard the Prophet (ﷺ) saying, "If a slave-girl of yours commits illegal sexual intercourse and her illegal sexual intercourse is proved, she should be lashed, and after that nobody should blame her, and if she commits illegal sexual intercourse the second time, she should be lashed and nobody should blame her after that, and if she does the offense for the third time and her illegal sexual intercourse is proved, she should be sold even for a hair rope."

Sahih al-Bukhari Book 34, Hadith 180