Asking Permission
Ṣaḥīḥ al-Bukhārī 6241
لَوْ أَعْلَمُ أَنَّكَ تَنْظُرُ لَطَعَنْتُ بِهِ فِي عَيْنِكَ، إِنَّمَا جُعِلَ الاِسْتِئْذَانُ مِنْ أَجْلِ الْبَصَرِ
law aʿlamu annaka tanẓuru laṭaʿantu bihi fī ʿaynika, innamā juʿila al-istiʾdhānu min ajli al-baṣari
Transliteration generated from the Arabic vowel marks
The full narration
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). (See Hadith No. 807, Vol)
Source
Ṣaḥīḥ al-Bukhārī · 6241