A man said, "O Messenger of Allah ﷺ! If a man finds another man with his wife, (committing adultery) should the husband kill him?" Later on I saw them (the man and his wife) doing Liʿan in the mosque (taking oaths, one accusing, and the other denying adultery).
يَا رَسُولَ اللَّهِ أَرَأَيْتَ رَجُلاً وَجَدَ مَعَ امْرَأَتِهِ رَجُلاً أَيَقْتُلُهُ فَتَلاَعَنَا فِي الْمَسْجِدِ وَأَنَا شَاهِدٌ
(the brother of Bani Saʿida) A man from the Ansar came to the Prophet ﷺ and said, "If a man finds another man sleeping with his wife, should he kill him?" That man and his wife then did Lian in the mosque while I was present.
أَنَّ رَجُلاً مِنَ الأَنْصَارِ جَاءَ إِلَى النَّبِيِّ ﷺ فَقَالَ أَرَأَيْتَ رَجُلاً وَجَدَ مَعَ امْرَأَتِهِ رَجُلاً أَيَقْتُلُهُ فَتَلاَعَنَا فِي الْمَسْجِدِ وَأَنَا شَاهِدٌ