Sahih Bukhari
Sahih Bukhari Volume 009, Book 089, Hadith Number 279.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 89. Judgments (Ahkaam)
Narrated By 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.