It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) said: "Whoever sells a slave who possesses property, then his property belongs to the seller, unless the buyer stipulates otherwise."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 14214
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد ضعيف لإبهام الراوي عن جابر، لكنه متابع