Musannaf Ibn Abi Shaybah

It is narrated from Ibn Abi Mulaykah that a woman (slave) was given a contract of manumission (kitabah). Then, during the period of kitabah, she gave birth to two children. Later, she passed away. Regarding this, Abdullah bin Zubair (may Allah be pleased with him) was asked. He said: If her children wish to remain on their mother’s contract of kitabah, then they are permitted; when they pay (the agreed amount), they will become free.

Ibrahim says that the children of a mukatab are in his status; they will be freed with his freedom, and will remain slaves with his slavery. And if their mother passes away, then they will try to pay the remaining amount of the contract of manumission; if it is paid, they will be freed, and if it is not paid, they will remain slaves.

Hazrat Ali (may Allah be pleased with him) said that the children of a mukatab (contracted slave) are also considered like him in striving to fulfill the payment of the contract.