من لا يحضره الفقيه, volume 3, page 154

Hadith.3560 - Muhammad ibn Isa al-Ubaydi narrated from al-Fadl ibn al-Mubarak: He wrote to Abu al-Hasan Ali ibn Muhammad (as) asking about a man who owns a slave, and the slave becomes ill. Is it better for the man to free him during his illness to gain a greater reward, or to leave him as a servant? Imam (as) replied: "If it is during his illness, then freeing him is better for him because Allah (swt), the Mighty and Majestic, frees a part of the master from the Fire for every part of the slave that is freed. However, if it is at the time of death, then leaving him as a servant is better than freeing him."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.3561 - Muhammad ibn Isa al-Ubaydi narrated from al-Fadl ibn al-Mubarak al-Basri, from his father, from Abu Abdullah (as): I said to Imam (as): "May I be your ransom, a man is required to free a believing slave, but he cannot find one. What should he do?" Imam (as) replied: "Resort to the children (among slaves) and free them. If they turn out to be believers, then that fulfills the requirement. But if they do not turn out to be believers, then there is no obligation upon you."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.3562 - Muawiyah ibn Maytharah narrated from Abu Abdullah (as): I asked him about a man who sells his slave at a reduced price so that he may be freed, and the slave says to him in private, "I will give you such-and-such amount." Is it permissible for the man to take it from him? Imam (as) replied: "He may take it from him willingly and ask him for it politely. But if the slave refuses, then let him leave it."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.3563 - Al-Sakuni narrated from Imam Jafar ibn Muhammad Al-Sadiq (as) from his father, Imam Muhammad ibn Ali Al-Baqir (as) (peace be upon them), who said: "Imam Ali ibn Al-Hussain (as) was asked about a contract-bound female slave (mukatabah) whose master had intercourse with her, and she became pregnant. Imam (as) replied: "He must pay her the equivalent of her dowry, and she must work to pay off her value. If she is unable to do so, then she is considered one of the mothers of children (Umm al-Walad)."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.