Hadith 17:933
Abu Bakr narrated to us, he said: Khalid ibn Makhlad narrated to us, from Sulayman ibn Bilal, from Suhayl, from his father, from Abu Hurayrah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "If a person were to look at people without their permission, it would be lawful for them to gouge out his eye."
حدثنا أبو بكر قال حدثنا خالد بن مخلد عن سليمان بن بلال عن سهيل عن أبيه عن أبي هريرة قال قال رسول الله صلى الله عليه وسلم لو أن أحدا اطلع على ناس بغير إذنهم حل لهم أن يفقأوا عينه