Selling a slave woman after repeated fornication

The Prophet ﷺ said: "If a slave woman commits unlawful sexual intercourse and her act is established, let him flog her and not reproach her. Then if she commits it again, let him flog her and not reproach her. Then if she commits it a third time, let him sell her, even for a rope made of hair."

قَالَ النَّبِيُّ ﷺ: «إِذَا زَنَتِ الأَمَةُ فَتَبَيَّنَ زِنَاهَا، فَلْيَجْلِدْهَا وَلاَ يُثَرِّبْ، ثُمَّ إِنْ زَنَتْ فَلْيَجْلِدْهَا وَلاَ يُثَرِّبْ، ثُمَّ إِنْ زَنَتِ الثَّالِثَةَ فَلْيَبِعْهَا وَلَوْ بِحَبْلٍ مِنْ شَعَرٍ».