Musnad Abu Ya'la al-Mawsili 154:20

Abu al-Harith Surayj ibn Yunus narrated to us, Hushaym narrated to us, Abu Bishr informed us, from Sa'id ibn Jubayr, from Ibn Umar, that he divorced his wife while she was menstruating. The Messenger of Allah (may Allah bless him and grant him peace) returned her to me until I divorced her while she was pure.