Ibn Sirin (may Allah have mercy on him) says: For 20 years people whom I do not suspect told me that Ibn Umar (may Allah be pleased with them both) gave his wife three divorces while she was menstruating, and he was ordered to take her back. I did not suspect them, yet I did not recognise the hadith, until I met Abu Ghallab Yunus bin Jubayr, who was reliable, and he told me that he had asked Ibn Umar, and he told him that he had given his wife one divorce while she was menstruating and was ordered to take her back. He says: I said: Was it counted against him? He said: What else, even if he was helpless and acted foolishly?
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الخلع والطلاق / 14954