Urwah narrated from this chain the same narration, and said: Regarding the share of the partner who did not free him: The slave will be told to earn and obtain his freedom himself.
Sayyiduna Abu Hurairah (may Allah be pleased with him) narrated from the Messenger of Allah (peace and blessings be upon him), he (peace be upon him) said: "If he has wealth, he will be freed from his wealth; if he does not have wealth, the slave will earn and obtain freedom."
Hadith Referenceمسند اسحاق بن راهويه / كتاب العتق و المكاتب / 477