Sahih al-Bukhari 2230
Sahih al-Bukhari · Book 34: Sales and Trade · The sale id a slave who is promised to be manumitted
Narrated Jabir:
حَدَّثَنَا ابْنُ نُمَيْرٍ ، حَدَّثَنَا وَكِيعٌ ، حَدَّثَنَا إِسْمَاعِيلُ ، عَنْ سَلَمَةَ بْنِ كُهَيْلٍ ، عَنْ عَطَاءٍ ، عَنْ جَابِرٍ ـ رضى الله عنه ـ قَالَ بَاعَ النَّبِيُّ صلى الله عليه وسلم الْمُدَبَّرَ .
The Prophet (ﷺ) sold a Mudabbar (on behalf of his master who was still living and in need of money).