Sunan Abu Dawud
1138
Sahih+3

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

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid