A man peeped through a round hole into the dwelling place of the Prophet (ﷺ) while the Prophet (ﷺ) had a Midra (an iron comb) with which he was scratching his head, the Prophet (ﷺ) said, "Had I known you were looking (through the hole), I would have pierced your eye with it (i.e., the comb)." Verily ! The order of taking permission to enter has been enjoined because of that sight, (that one should not look unlawfully at the state of others). [8:258-O.B]