It is narrated from Sayyiduna Imran bin Husayn (may Allah be pleased with him) that a man freed six slaves. This reached the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) cast lots among them, freed two and kept four in slavery.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15393