Abu Dharr reported Allah's Messenger ﷺ as saying, “If anyone removes a curtain and looks into a house before receiving permission and sees anything in those within which should not be seen, he has committed an offence which it is not lawful for him to commit. If a man confronted him when he looked in and put out his eye, I would not blame him; but if a man passes a door which has no curtain and is not shut and looks in, he has committed no sin, for the sin pertains only to the people inside.” Tirmidhi transmitted it, saying this is a gharib tradition.