(495) بَابُ الاسْتِئْذَانُ مِنْ أَجْلِ النَّظَرِ
The Prophet, may Allah bless him and grant him peace, said, "Theear is put in the place of the eye."
Reference: Al-Adab Al-Mufrad 1071
In-book reference: Book 43, Hadith 21
English translation: Book 43, Hadith 1071