Musannaf Ibn Abi Shaybah

Hazrat Tawus says that in the case of zihar, freeing an umm walad will suffice.

Ibrahim also says the same.

It is narrated from Ibrahim in the same manner.

It is narrated in the same manner from Hazrat Hisham.

Hazrat Tawoos says that in the expiation of zihar, freeing an umm walad will not be sufficient.

Imam Zuhri states that in the case of kafarah for zihar, freeing an umm walad will not suffice.

Hasan says that in the case of zihar, freeing an umm walad is not sufficient.

Yunus narrates that Hasan did not consider it permissible to free an umm walad as expiation.

Hazrat Hammad says that freeing an Umm Walad is not sufficient as expiation for Zihar, and Hazrat Hakam says that in my view, it is preferable to free any other slave (and I hope so).

Ibrahim and Hazrat Sha'bi state that in freeing a slave, freeing an umm walad will not be sufficient.