A man declared that his slave would be free after his death, but he had no other property. So the Prophet ﷺ ordered (to sell him). He was then sold for seven hundred or nine hundred (dirhams).
عَنْ دُبُرٍ مِنْهُ وَلَمْ يَكُنْ لَهُ مَالٌ غَيْرُهُ فَأَمَرَ بِهِ النَّبِيُّ ﷺ فَبِيعَ بِسَبْعِمِائَةٍ أَوْ بِتِسْعِمِائَةٍ