Musannaf Ibn Abi Shaybah

Hazrat Qasim bin Muhammad narrates that a tribe of the Arabs asked Hazrat Muawiyah (may Allah be pleased with him) whether a man could have intercourse with two slave sisters. He gave a fatwa permitting it. This matter reached Hazrat Nu'man bin Bashir, who asked Hazrat Muawiyah (may Allah be pleased with him) about it, and he acknowledged giving that fatwa. Upon this, Hazrat Nu'man bin Bashir said: Tell me, if a slave woman was with a person whose sister was also a slave woman, would it be permissible for him to have intercourse with her? Hearing this, Hazrat Muawiyah (may Allah be pleased with him) said: You have opened my eyes. Go to those people and prohibit them from doing so. It is not appropriate for them to do this. Hazrat Qasim bin Muhammad says: I said that this is a kinship of freedom and so on.