Language:
كتاب الأحكام
93  
Judgments (Ahkaam)
(18)
Chapter: Whoever gave judgements of Li'an in the mosque
(18)
باب مَنْ قَضَى وَلاَعَنَ فِي الْمَسْجِدِ
Sahih al-Bukhari 7166

Narrated Sahl:

(the brother of Bani Sa`ida) 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.

حَدَّثَنَا يَحْيَى، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا ابْنُ جُرَيْجٍ، أَخْبَرَنِي ابْنُ شِهَابٍ، عَنْ سَهْلٍ، أَخِي بَنِي سَاعِدَةَ أَنَّ رَجُلاً، مِنَ الأَنْصَارِ جَاءَ إِلَى النَّبِيِّ صلى الله عليه وسلم فَقَالَ أَرَأَيْتَ رَجُلاً وَجَدَ مَعَ امْرَأَتِهِ رَجُلاً، أَيَقْتُلُهُ فَتَلاَعَنَا فِي الْمَسْجِدِ وَأَنَا شَاهِدٌ‏.‏
Reference : Sahih al-Bukhari 7166
In-book reference : Book 93, Hadith 30
USC-MSA web (English) reference : Vol. 9, Book 89, Hadith 279
  (deprecated numbering scheme)