It was narrated from Ibn`Umar that the Messenger of Allah ( صلی اللہ علیہ وسلم ) said:`“Whoever frees a slave who has some wealth, the slave's wealth belongs to him, unless the master stipulates that it will belong to him.”

‘Umair, the freed slave of Abdullah ibn Mas‘ud (may Allah be pleased with him), says that Ibn Mas‘ud (may Allah be pleased with them both) said to him: Umair! I have set you free gladly. I heard the Messenger of Allah (peace and blessings of Allah be upon him) say:“Whoever frees a slave and does not mention his property, then the property belongs to the slave.”Tell me, what property do you have?

A similar hadith is narrated through this chain as well.