Sahih Bukhari

Narrated Abu Huraira and Zaid bin Khalid:Allah's Messenger (ﷺ) was asked about the slave-girl, if she was a virgin and committed illegal sexual intercourse. The Prophet (ﷺ) said, ""If she committed illegal sexual intercourse, lash her, and if she did it a second time, then lash her again, and if she repeated the third time, then sell her even for a hair rope."" Ibn Shihab said, ""I don't know whether to sell her after the third or fourth offense