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The believing women used to pray the morning prayer with the Messenger of Allah and then return wrapped in their mantles. No one could recognise them.

"The women used to pray Subh with the Messenger of Allah (ﷺ), wrapped in their wrappers, then they would return, and no one would recognize them because of the darkness."

"The believing women used to perform the Subh prayer with the Prophet, then they would go back to their families and no one would recognize them," meaning of the darkness.