Volume 8 · Book 73 · Hadith 124
Narrated Abu Said Al-Khudri: The Prophet was more shy than a virgin in her separate room. And if he saw a thing which he disliked, we would recognize that (feeling) in his face.
— Sahih Bukhari, Volume 8, Book 73: Good Manners and Form (Al-Adab), Hadith #124