Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
abudawud:1138al-Nufaylī > Zuhayr > ʿĀṣim al-Aḥwal > Ḥafṣah b. Sīrīn > Um ʿAṭiyyah

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.  

أبو داود:١١٣٨حَدَّثَنَا 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