Sahih Muslim Book - 8, Hadith - 2055

حَدَّثَنَا يَحْيَى بْنُ يَحْيَى أَخْبَرَنَا أَبُو خَيْثَمَةَ عَنْ عَاصِمٍ الأَحْوَلِ عَنْ حَفْصَةَ بِنْتِ سِيرِينَ عَنْ أُمِّ عَطِيَّةَ قَالَتْ كُنَّا نُؤْمَرُ بِالْخُرُوجِ فِى الْعِيدَيْنِ وَالْمُخَبَّأَةُ وَالْبِكْرُ قَالَتِ الْحُيَّضُ يَخْرُجْنَ فَيَكُنَّ خَلْفَ النَّاسِ يُكَبِّرْنَ مَعَ النَّاسِ.

It was narrated that Umm 'Atiyyah said: "We were commanded to bring out women in seclusion and virgins on the two 'Id. And the menstruating women were to come out but stay behind the people, reciting Takbir with the people."