Narrated Sahl:

(the brother of Bani Sa'ida) A man from the Ansar came to the Prophet 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.

حَدَّثَنَا يَحْيَى، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا ابْنُ جُرَيْجٍ، أَخْبَرَنِي ابْنُ شِهَابٍ، عَنْ سَهْلٍ، أَخِي بَنِي سَاعِدَةَ أَنَّ رَجُلاً، مِنَ الأَنْصَارِ جَاءَ إِلَى النَّبِيِّ ﷺ فَقَالَ أَرَأَيْتَ رَجُلاً وَجَدَ مَعَ امْرَأَتِهِ رَجُلاً، أَيَقْتُلُهُ فَتَلاَعَنَا فِي الْمَسْجِدِ وَأَنَا شَاهِدٌ.