A man peeped through a hole in the door of Messenger of Allah ﷺ's house, and at that time, Messenger of Allah ﷺ had a Midri (an iron comb or bar) with which he was rubbing his head. So when Messenger of Allah ﷺ saw him, he said (to him), "If I had been sure that you were looking at me (through the door), I would have poked your eye with this (sharp iron bar)." Messenger of Allah ﷺ added, "The asking for permission to enter has been enjoined so that one may not look unlawfully (at what there is in the house without the permission of its people)."  

أَخْبَرَهُ أَنَّ رَجُلاً اطَّلَعَ فِي جُحْرٍ فِي باب رَسُولِ اللَّهِ ﷺ وَمَعَ رَسُولِ اللَّهِ ﷺ مِدْرًى يَحُكُّ بِهِ رَأْسَهُ فَلَمَّا رَآهُ رَسُولُ اللَّهِ ﷺ قَالَ لَوْ أَعْلَمُ أَنْ تَنْتَظِرَنِي لَطَعَنْتُ بِهِ فِي عَيْنَيْكَ قَالَ رَسُولُ اللَّهِ ﷺ إِنَّمَا جُعِلَ الإِذْنُ مِنْ قِبَلِ الْبَصَرِ  

A man peeped into a room of the Prophet. The Prophet ﷺ stood up, holding an arrow head. It is as if I am just looking at him, trying to stab the man.  

أَنَّ رَجُلاً اطَّلَعَ مِنْ بَعْضِ حُجَرِ النَّبِيِّ ﷺ فَقَامَ إِلَيْهِ النَّبِيُّ ﷺ بِمِشْقَصٍ أَوْ بِمَشَاقِصَ فَكَأَنِّي أَنْظُرُ إِلَيْهِ يَخْتِلُ الرَّجُلَ لِيَطْعُنَهُ  

That he heard Messenger of Allah ﷺ saying, "We (Muslims) are the last (to come) but (will be) the foremost (on the Day of Resurrection)." And added, "If someone is peeping (looking secretly) into your house without your permission, and you throw a stone at him and destroy his eyes, there will be no blame on you."  

سَمِعَ رَسُولَ اللَّهِ ﷺ يَقُولُ نَحْنُ الآخِرُونَ السَّابِقُونَ يَوْمَ الْقِيَامَةِ وَبِإِسْنَادِهِ لَوِ اطَّلَعَ فِي بَيْتِكَ أَحَدٌ وَلَمْ تَأْذَنْ لَهُ خَذَفْتَهُ بِحَصَاةٍ فَفَقَأْتَ عَيْنَهُ مَا كَانَ عَلَيْكَ مِنْ جُنَاحٍ