Ibn Shihab narrated about the invokers of curses and the practice of (li'an) based on the authority of Sahl b. Sa'd, of the tribe of Sa'ida. that a person from the Ansar came to Allah's Apostle ﷺ and said: Allah's Messenger, 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.

وَحَدَّثَنَا مُحَمَّدُ بْنُ رَافِعٍ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا ابْنُ جُرَيْجٍ، أَخْبَرَنِي ابْنُ شِهَابٍ، عَنِ الْمُتَلاَعِنَيْنِ، وَعَنِ السُّنَّةِ، فِيهِمَا عَنْ حَدِيثِ، سَهْلِ بْنِ سَعْدٍ أَخِي بَنِي سَاعِدَةَ 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 " .