Abu Dawud Book 24, Hadith Number 3927.

Chapter : The view that the slave will be required to work to pay the price of the remaining portion.

Narated By N/A : Abu Hurairah reported the Prophet (may peace be upon him) as saying: If anyone emancipates his share in a slave, he is to be completely emancipated by his money if he has money. But if he has no money. a fair price for the slave should be fixed, and the slave is required to work for his master according to the proportion of his price, but he must not be overburdened.

Abu Dawud said: In the version of both the narrators the words are “he will be required to work and must not be overburdened”. This is the version of ‘Ali.