حَدَّثَنَا النُّفَيْلِيُّ، حَدَّثَنَا زُهَيْرٌ، حَدَّثَنَا عَاصِمٌ الأَحْوَلُ، عَنْ حَفْصَةَ بِنْتِ سِيرِينَ، عَنْ أُمِّ عَطِيَّةَ، قَالَتْ كُنَّا نُؤْمَرُ بِهَذَا الْخَبَرِ قَالَتْ وَالْحُيَّضُ يَكُنَّ خَلْفَ النَّاسِ فَيُكَبِّرْنَ مَعَ النَّاسِ ‏.‏

This tradition has also been narrated by Umm 'Atiyyah though a different chain of transmitters. She said: We were commanded to go out (for offering the 'Id prayer). She further said: The menstruating women stood behind the people and they uttered the takbir (Allah is most great) along with the people. Translation Not Available

Book Ref: Sunan Abi Dawud Book 2 Hadith 1138
Web Ref:  Sunan Abi Dawud Book 2 Hadith 1134