Sahih Al Bukhari – Book of Times Of The Prayers
Volumn 001, Book 010, Hadith Number 552.
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Narated By 'Aisha RA: The believing women covered with their veiling sheets used to attend the Fajr prayer with Allah's Apostle, and after finishing the prayer they would return to their home and nobody could recognize them because of darkness.
Junaid Tahir