Sunan an-Nasa'i 3389

Ubaydullah bin Sa'id al-Sarkhasi narrated to us; Yahya bin Sa'id al-Qattan narrated to us, from Ubaydullah bin Umar, who informed me, from Nafi, from Abdullah, that he divorced his wife while she was menstruating. Umar sought a ruling from the Messenger of Allah and said, ‘Abdullah has divorced his wife while she is menstruating.’ He said, ‘Tell Abdullah to take her back and leave her until she becomes pure from this menstruation, then menstruates again. When she becomes pure, if he wishes, let him separate from her before having intercourse with her; and if he wishes, let him keep her. That is the waiting period for which Allah, Mighty and Sublime, commanded that women be divorced.’