Sunan Abi dawud:3941 Chapter: If A Mukathib Pays Part Of His Contract Of Manumission Then Becomes Incapacitated Or Dies Book 31, Hadith 16

The tradition mentioned above has also been transmitted by Ibn ‘Umar to the same effect through a different chain of narrators. Nafi’ sometimes said: He will be emancipated to the extent of the share which he emancipated, and sometimes he did not say these words.