(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
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
Messenger of Allah, tell me about the person who found a man with his wife. The remaining part of the hadith is the same (but) with this addition: They invoked curses in the mosque and I was present there. And he narrated in the hadith: He divorced her with three pronouncements before Messenger of Allah ﷺ commanded him (to get separation). He separated from her in the presence of Allah's Apostle ﷺ, whereupon he said: There is a separation between the invokers of curses.
أَنَّ رَجُلاً مِنَ الأَنْصَارِ جَاءَ إِلَى النَّبِيِّ ﷺ فَقَالَ يَا رَسُولَ اللَّهِ أَرَأَيْتَ رَجُلاً وَجَدَ مَعَ امْرَأَتِهِ رَجُلاً وَذَكَرَ الْحَدِيثَ بِقِصَّتِهِ وَزَادَ فِيهِ فَتَلاَعَنَا فِي الْمَسْجِدِ وَأَنَا شَاهِدٌ وَقَالَ فِي الْحَدِيثِ فَطَلَّقَهَا ثَلاَثًا قَبْلَ أَنْ يَأْمُرَهُ رَسُولُ اللَّهِ ﷺ فَفَارَقَهَا عِنْدَ النَّبِيِّ ﷺ فَقَالَ النَّبِيُّ ﷺ ذَاكُمُ التَّفْرِيقُ بَيْنَ كُلِّ مُتَلاَعِنَيْنِ