Musannaf Ibn Abi Shaybah

Hazrat Ibn Abbas (may Allah be pleased with them both), Hazrat Jabir bin Zaid, Hazrat Saeed bin Jubair, Hazrat Saeed bin Musayyib, and Hazrat Sulaiman bin Yasar (may Allah have mercy on them) say that if a person says to his wife, "You are forbidden to me," then this is considered as an oath.