Sahih Al Bukhari Hadith Number 867

Narrated `Aisha: When Allah’s Messenger (peace be upon him) finished the Fajr prayer, the women would leave covered in their sheets and were not recognized owing to the darkness.

10  Call to Prayers (Adhaan)
Hadith number 867
Volume no 1
Chapter: 163 (The waiting of the people for the religious learned Imam to get up (after the prayer to depart)