Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Abu Yahya Al-A'raj (may Allah be pleased with him) that it was asked from the Noble Prophet (peace and blessings be upon him) that a slave was set free by his master at the time of his (the master's) death, and he (the master) had no other wealth besides him, and there is also debt upon him (the master). The Holy Prophet (peace and blessings be upon him) ordered that the slave should strive to pay off his master's debt.

It is narrated from Hazrat Hasan (may Allah be pleased with him) that Hazrat Ali (may Allah be pleased with him) was asked about a person who, at the time of his death, set his slave free and had no other wealth besides this, and he was also in debt? He (may Allah be pleased with him) replied: The slave will be set free, but he will strive to the extent of his value.

It is narrated from Hazrat Qasim, may Allah have mercy on him, that a woman freed her slave-girl and she had no other wealth besides her. Hazrat Abdullah, may Allah be pleased with him, said: She will strive to pay her value.

Ibrahim (may Allah have mercy on him) said regarding the person who, in his terminal illness, freed his slave and then died, and he also had a debt upon him, and besides this slave he had no other wealth: he said, the slave will strive to the extent of his value; if his value is more than the debt, then he will strive for the creditors to the extent of their debt, and whatever remains will be considered; then two-thirds of it will belong to the heirs and one-third will be his (i.e., for the bequest).

Hazrat Sha'bi (may Allah have mercy on him) says that if a person frees a slave during his terminal illness and he has no other wealth besides this, then a just person will estimate the value of that slave, and then the slave will strive to pay that value.