(40) باب مَنْ رَأَى مَعَ امْرَأَتِهِ رَجُلاً فَقَتَلَهُ
Narrated 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 (ﷺ) 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."
Reference: Sahih al-Bukhari 6846
In-book reference: Book 86, Hadith 69
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 82, Hadith 829