Musannaf Ibn Abi Shaybah 24083 — The child of a mukatab slave woman

It is narrated from Ibn Abi Mulaykah that a woman (a slave woman) was given a contract of manumission. She then gave birth to two children while under the contract, and then she died. Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with him) was asked about this. He said: If her children wish to continue on their mother's contract, they are permitted to do so; when they pay it off, they will be free.