Al-Adab Al-Mufrad #1073

Sahl ibn Sa'd told him that a man looked from a room through the door of the Prophet, may Allah bless him and grant him peace, while the Prophet, may Allah bless him and grant him peace, had a comb with which he was scratching his hair. When the Prophet, may Allah bless him and grant him peace, saw him, he said, "If I had known that you were looking at me, I would have stabbed you in the eye with this!"