The Prophet ﷺ sold a mudabbar slave.
حدثنا وكيع حدثنا سفيان عن أبي الزبير
أن النبي ﷺ باع المدبر
No references are available.
Its isnad is sahih, and it is found in Saeed bin Mansur 443, Hind edition. Many scholars held that this has been abrogated.