Hadith 2691
Lady Aisha (may Allah be pleased with her) narrates that when we were in the state of Ihram with the Messenger of Allah (peace be upon him), if a caravan passed by us, we would let our sheets hang over our faces. In the narration of Jarir (may Allah have mercy on him), it is mentioned that when they would pass by, and in the narration of Hushaym, it is mentioned that when they would pass by us, we would uncover our faces.