Abu Hurayra said, "The Messenger of Allah, may Allah bless him and grant him peace, said, "When the eye enters, permission to enter should not be given."  

قَالَ رَسُولُ اللهِ ﷺ إِذَا دَخَلَ الْبَصَرُ فَلا إِذْنَ  

Muslim ibn Nadhir said, "A man asked permission to enter from Hudhayfa. He looked in and said, 'May I come in?' Hudhayfa replied, 'As for you eye, it has already entered. As for your bottom, it has not entered.'"  

قَالَ حُذَيْفَةُ أَمَّا عَيْنُكَ فَقَدْ دَخَلَتْ وَأَمَّا اسْتُكَ فَلَمْ تَدْخُلْ  

Anas ibn Malik reported that a bedouin came to the house of the Messenger of Allah, may Allah bless him and grant him peace, and put his eye to the crack of the door. Therefore the Prophet took an arrow or a sharp stick and aimed it at the bedouin as to gouge out his eye. The man left and the Prophet said, "If you had stayed, I would have gouged out your eye."  

أَنَّ أَعْرَابِيًّا أَتَى بَيْتَ رَسُولِ اللهِ ﷺ فَأَلْقَمَ عَيْنَهُ خَصَاصَةَ الْبَابِ فَأَخَذَ سَهْمًا أَوْ عُودًا مُحَدَّدًا فَتَوَخَّى الأعْرَابِيَّ لِيَفْقَأَ عَيْنَ الأعْرَابِيِّ فَذَهَبَ فَقَالَ أَمَا إِنَّكَ لَوْ ثَبَتَّ لَفَقَأْتُ عَيْنَكَ  

'Umar ibn al-Khattab said, "Anyone who fills his eye with the contents of a house before he has been given permission has gone astray."  

أَنْ يُؤْذَنَ لَهُ فَقَدْ فَسَقَ  

Thawban, the mawla of the Messenger of Allah, may Allah bless him and grant him peace, related that the Prophet, may Allah bless him and grant him peace, said, "It is not lawful for a Muslim man to look inside a house until he has been given permission. If he does so, he has entered. He should not act as the imam of a people and then single himself out for supplication to the exclusion of others. He should not pray while he needs to urinate until he has relieved himself."  

حَدَّثَهُ أَنَّ ثَوْبَانَ مَوْلَى رَسُولِ اللهِ ﷺ حَدَّثَهُ أَنَّ النَّبِيَّ ﷺ قَالَ لاَ يَحِلُّ لِامْرِئٍ مُسْلِمٍ أَنْ يَنْظُرَ إِلَى جَوْفِ بَيْتٍ حَتَّى يَسْتَأْذِنَ فَإِنْ فَعَلَ فَقَدْ دَخَلَ وَلاَ يَؤُمُّ قَوْمًا فَيَخُصُّ نَفْسَهُ بِدَعْوَةٍ دُونَهُمْ حَتَّى يَنْصَرِفَ وَلاَ يُصَلِّي وَهُوَ حَاقِنٌ حَتَّى يَتَخَفَّفَ