question #1 Sahih al-Bukhari 423, Book 8, Hadith 73 : What is the Islamic procedure for a husband who suspects his wife of adultery?

A man said, “O Allah’s Messenger (ﷺ)! If a man finds another man with his wife, (committing adultery)
should the husband kill him?” Later on I saw them (the man and his wife) doing Li`an in the mosque
(taking oaths, one accusing, and the other denying adultery).