Ibn Tawus narrated from his father that he heard 'Abdullah bin 'Umar being asked about a man who divorced his wife when she was menstruating. He said: "Do you know 'Abdullah bin 'Umar?" He said: "Yes." He said: "He divorced his wife when she was menstruating, and 'Umar went to the Prophet (ﷺ) and told him about that. He ordered him to take her back until she became pure," and I did not hear him adding anything to that.
Source: sunnah.com
Other translations
Arabic
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا أَبُو عَاصِمٍ، قَالَ ابْنُ جُرَيْجٍ أَخْبَرَنِيهِ ابْنُ طَاوُسٍ، عَنْ أَبِيهِ، أَنَّهُ سَمِعَ عَبْدَ اللَّهِ بْنَ عُمَرَ، يُسْأَلُ عَنْ رَجُلٍ، طَلَّقَ امْرَأَتَهُ حَائِضًا فَقَالَ أَتَعْرِفُ عَبْدَ اللَّهِ بْنَ عُمَرَ قَالَ نَعَمْ . قَالَ فَإِنَّهُ طَلَّقَ امْرَأَتَهُ حَائِضًا فَأَتَى عُمَرُ النَّبِيَّ صلى الله عليه وسلم فَأَخْبَرَهُ الْخَبَرَ فَأَمَرَهُ أَنْ يُرَاجِعَهَا حَتَّى تَطْهُرَ . وَلَمْ أَسْمَعْهُ يَزِيدُ عَلَى هَذَا .
sunnah.com