Confusion Regarding Sale of Mudabbar Slave

This hadith in **Sahih Al Bukhari** shows Prophet Muhammad صلى الله عليه وسلم sold Mudabbar. While it is not permissible to sell Mudabbar as per Fuqaha. > حَدَّثَنَا آدَمُ بْنُ أَبِي إِيَاسٍ، حَدَّثَنَا شُعْبَةُ، حَدَّثَنَا > عَمْرُو بْنُ دِينَارٍ، سَمِعْتُ جَابِرَ بْنَ عَبْدِ اللَّهِ ـ رضى الله > عنهما ـ قَالَ أَعْتَقَ رَجُلٌ مِنَّا عَبْدًا لَهُ عَنْ دُبُرٍ، فَدَعَا > النَّبِيُّ صلى الله عليه وسلم بِهِ فَبَاعَهُ‏.‏ قَالَ جَابِرٌ مَاتَ > الْغُلاَمُ عَامَ أَوَّلَ‏.‏ > > Narrated Jabir bin `Abdullah: A man amongst us declared that his slave > would be freed after his death. The Prophet (ﷺ) called for that slave > and sold him. The slave died the same year. > > Sahih al-Bukhari 2534 I am a little confused over this matter related to Mudabbar. Please explain whether it is permissible or not to sell Mudabbar. Also was it just only exceptional case related to the Prophet!