Musnad Ahmad 1153:2203

Yunus and Surayj narrated to us, they said: Fulayh narrated to us, from Abd al-Rahman ibn al-Qasim, from al-Qasim ibn Muhammad, from Aisha, who said: "The Messenger of Allah (peace and blessings of Allah be upon him) would pray the dawn prayer, and the believing women would depart wrapped in their garments, not being recognized due to the darkness (ghalas), or he said: they would not recognize one another."