Yahya related to me from Malik from Ibn Shihab that Sahl ibn Sad as-Saidi told him that Uwaymir al-Ajlani came to Asim ibn Adi al- Ansari and said to him, "Asim! What do you think a man who finds another man with his wife should do? Should he kill him and then be killed himself, or what should .he do? Asim! ask the Messenger of Allah ﷺ about that for me." Asim asked the Messenger of Allah ﷺ about it. The Messenger of Allah ﷺ was revolted by the questions and reproved them until what he heard from the Messenger of Allah, may Allah bless him and grant him peace. was intolerable for Asim. When Asim returned to his people, Uwaymir came to him and said, " Asim! what did the Messenger of Allah ﷺ say to you?" Asim said to Uwaymir, "You didn't bring me any good. The Messenger of Allah ﷺ was revolted by the question which I asked him." Uwaymir said, "By Allah! I will not stop until I ask him about it!" Uwaymir stood up and went to the Messenger of Allah ﷺ in the middle of the people and said, "Messenger of Allah! What do you think a man who finds another man with his wife should do? Should he kill him and then be killed himself, or what should he do?" The Messenger of Allah ﷺ said, "Something has been sent down about you and your wife, so go and bring her."
Sahl continued, "They mutually cursed one another in the presence of the Messenger ﷺ and I was present with the people. When they finished cursing each other, Uwaymir said, 'I shall have lied about her, Messenger of Allah, if I keep her,' and pronounced the divorce three times before the Messenger of Allah ﷺ ordered him to do it."
Malik said that Ibn Shihab said, "That was how the sunna of a couple mutually cursing each other was established (lian)."

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، أَنَّ سَهْلَ بْنَ سَعْدٍ السَّاعِدِيَّ، أَخْبَرَهُ أَنَّ عُوَيْمِرًا الْعَجْلاَنِيَّ جَاءَ إِلَى عَاصِمِ بْنِ عَدِيٍّ الأَنْصَارِيِّ فَقَالَ لَهُ يَا عَاصِمُ أَرَأَيْتَ رَجُلاً وَجَدَ مَعَ امْرَأَتِهِ رَجُلاً أَيَقْتُلُهُ فَتَقْتُلُونَهُ أَمْ كَيْفَ يَفْعَلُ سَلْ لِي يَا عَاصِمُ عَنْ ذَلِكَ رَسُولَ اللَّهِ ﷺ . فَسَأَلَ عَاصِمٌ رَسُولَ اللَّهِ ﷺ عَنْ ذَلِكَ فَكَرِهَ رَسُولُ اللَّهِ ﷺ الْمَسَائِلَ وَعَابَهَا حَتَّى كَبُرَ عَلَى عَاصِمٍ مَا سَمِعَ مِنْ رَسُولِ اللَّهِ ﷺ فَلَمَّا رَجَعَ عَاصِمٌ إِلَى أَهْلِهِ جَاءَهُ عُوَيْمِرٌ فَقَالَ يَا عَاصِمُ مَاذَا قَالَ لَكَ رَسُولُ اللَّهِ ﷺ فَقَالَ عَاصِمٌ لِعُوَيْمِرٍ لَمْ تَأْتِنِي بِخَيْرٍ قَدْ كَرِهَ رَسُولُ اللَّهِ ﷺ الْمَسْأَلَةَ الَّتِي سَأَلْتُهُ عَنْهَا . فَقَالَ عُوَيْمِرٌ وَاللَّهِ لاَ أَنْتَهِي حَتَّى أَسْأَلَهُ عَنْهَا . فَأَقْبَلَ عُوَيْمِرٌ حَتَّى أَتَى رَسُولَ اللَّهِ ﷺ وَسْطَ النَّاسِ فَقَالَ يَا رَسُولَ اللَّهِ أَرَأَيْتَ رَجُلاً وَجَدَ مَعَ امْرَأَتِهِ رَجُلاً أَيَقْتُلُهُ فَتَقْتُلُونَهُ أَمْ كَيْفَ يَفْعَلُ فَقَالَ رَسُولُ اللَّهِ ﷺ " قَدْ أُنْزِلَ فِيكَ وَفِي صَاحِبَتِكَ فَاذْهَبْ فَأْتِ بِهَا " . قَالَ سَهْلٌ فَتَلاَعَنَا وَأَنَا مَعَ النَّاسِ عِنْدَ رَسُولِ اللَّهِ ﷺ فَلَمَّا فَرَغَا مِنْ تَلاَعُنِهِمَا قَالَ عُوَيْمِرٌ كَذَبْتُ عَلَيْهَا يَا رَسُولَ اللَّهِ إِنْ أَمْسَكْتُهَا . فَطَلَّقَهَا ثَلاَثًا قَبْلَ أَنْ يَأْمُرَهُ رَسُولُ اللَّهِ . وَقَالَ مَالِكٌ قَالَ ابْنُ شِهَابٍ فَكَانَتْ تِلْكَ بَعْدُ سُنَّةَ الْمُتَلاَعِنَيْنِ .