Sahih Muslim – Hadith No : 5765

Sahl b. Sa’d as-Sa’idi reported that a person peeped through the hole of the door of Allah’s Messenger (may peace be upon him) and he had with him some pointed thing with which he had been adjusting (the hair of his head). Allah’s Messenger (may peace be upon him) said to him: If I were to know that you had been peeping. I would have thrust it in your eyes. Allah has prescribed seeking permission because of protection against glance.

Hadith In Arabic Text :

وحدثني حرملة بن يحيى، أخبرنا ابن وهب، أخبرني يونس، عن ابن شهاب، أنأخبره أن رجلا اطلع من جحر في باب رسول الله صلى الله عليه وسلم ومع رسول الله صلى الله عليه وسلم مدرى يرجل به رأسه فقال له رسول الله صلى الله عليه وسلم ‏”‏ لو أعلم أنك تنظر طعنت به في عينك إنما جعل الله الإذن من أجل البصر ‏”‏ ‏.‏

Chapter : The Book on General Behaviour – كتاب الآداب