ENOfficial
Narrated Ibn `Umar: (Divorcing my wife during her menses) was counted as one legal divorce.
Source: sunnah.com
Other translations
Arabic
وَقَالَ أَبُو مَعْمَرٍ حَدَّثَنَا عَبْدُ الْوَارِثِ، حَدَّثَنَا أَيُّوبُ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عُمَرَ، قَالَ حُسِبَتْ عَلَىَّ بِتَطْلِيقَةٍ.
sunnah.com