Musannaf Ibn Abi Shaybah

Hasan, Hazrat Saeed bin Musayyib, and Hazrat Khallas state that if a person gives three divorces to a woman and that woman is pregnant, then there is no harm in marrying her sister during her waiting period. Ubaid bin Nazeelah considered this to be disliked. When this matter was mentioned to Hasan, it seemed that he also disliked it.