Sahih Bukhari Volume 008, Book 082, Hadith Number 829.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 82. Punishment of Disbelievers at War with Allah and his Apostle
Narrated By Al-Mughira : Sa'd bin Ubada said, "If I found a man with my wife, I would kill him with the sharp side of my sword." When the Prophet heard that he said, "Do you wonder at Sa'd's sense of ghira (self-respect)? Verily, I have more sense of ghira than Sa'd, and Allah has more sense of ghira than I."