Tawus narrated that he heard Sayyiduna Ibn Umar (may Allah be pleased with them both) being asked about a man who divorced his wife while she was menstruating. He said: Do you know Abdullah bin Umar? He said: Yes. He said: He divorced his wife while she was menstruating, so Umar (may Allah be pleased with him) went to the Prophet (peace and blessings be upon him) and told him (peace and blessings be upon him) about it, and he (peace and blessings be upon him) ordered him to take her back. Tawus said: I did not hear him say anything more than that.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13399