The Prophet ﷺ said, "Whoever frees his share in a jointly owned slave, the remaining value is assessed against his wealth. If he has no wealth, then only the portion he freed is emancipated."
حدثنا حماد عن مالك عن نافع
أن النبي ﷺ قال من أعتق شركا له في مملوك قوم عليه في ماله فإن لم يكن له مال عتق منه ما عتق