Narrated Sahl bin Sa`d: A man peeped through a round hole into the dwelling place of the Prophet, while the Prophet (ﷺ) had a Midray (an iron comb) with which he was scratching his head. the Prophet (ﷺ) said, ” Had 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)”.
Sahih al-Bukhari 6241 In-book reference : Book 79, Hadith 15
المِدْرَى : ما يُعمَل منْ حديدٍ أَو خشب على شكل سِنٍّ من أسنان المُشْط ، وأَطول منه ، يُسَرّح به الشعر .