Sahih al-Bukhari 6241
صحيح البخاري#6241Sahihحَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، قَالَ الزُّهْرِيُّ حَفِظْتُهُ كَمَا أَنَّكَ هَا هُنَا عَنْ سَهْلِ بْنِ سَعْدٍ قَالَ اطَّلَعَ رَجُلٌ مِنْ جُحْرٍ فِي حُجَرِ النَّبِيِّ صلى الله عليه وسلم وَمَعَ النَّبِيِّ صلى الله عليه وسلم مِدْرًى يَحُكُّ بِهِ رَأْسَهُ فَقَالَ " لَوْ أَعْلَمُ أَنَّكَ تَنْظُرُ لَطَعَنْتُ بِهِ فِي عَيْنِكَ، إِنَّمَا جُعِلَ الاِسْتِئْذَانُ مِنْ أَجْلِ الْبَصَرِ ".
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)
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 79:15