كتاب البيوع
Read the English translation first, with the original Arabic directly underneath.
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."
إِنْ زَنَتْ فَاجْلِدُوهَا، ثُمَّ إِنْ زَنَتْ فَاجْلِدُوهَا، ثُمَّ إِنْ زَنَتْ فَبِيعُوهَا وَلَوْ بِضَفِيرٍ