Language:
كتاب البيوع
34  
Sales and Trade
(66)
Chapter: The selling of an adulterer slave
(66)
باب بَيْعِ الْعَبْدِ الزَّانِي‏
Sahih al-Bukhari 2152

Narrated Abu Huraira:

The Prophet (ﷺ) said, "If a slave-girl commits illegal sexual intercourse and it is proved beyond doubt, then her owner should lash her and should not blame her after the legal punishment. And then if she repeats the illegal sexual intercourse he should lash her again and should not blame her after the legal punishment, and if she commits it a third time, then he should sell her even for a hair rope."

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، حَدَّثَنَا اللَّيْثُ، قَالَ حَدَّثَنِي سَعِيدٌ الْمَقْبُرِيُّ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ أَنَّهُ سَمِعَهُ يَقُولُ قَالَ النَّبِيُّ صلى الله عليه وسلم ‏ "‏ إِذَا زَنَتِ الأَمَةُ فَتَبَيَّنَ زِنَاهَا فَلْيَجْلِدْهَا، وَلاَ يُثَرِّبْ، ثُمَّ إِنْ زَنَتْ فَلْيَجْلِدْهَا، وَلاَ يُثَرِّبْ، ثُمَّ إِنْ زَنَتِ الثَّالِثَةَ فَلْيَبِعْهَا، وَلَوْ بِحَبْلٍ مِنْ شَعَرٍ ‏"‏‏.‏
Reference : Sahih al-Bukhari 2152
In-book reference : Book 34, Hadith 104
USC-MSA web (English) reference : Vol. 3, Book 34, Hadith 362
  (deprecated numbering scheme)