Chapter 20: The Book of Invoking Curses
Abu Huraira (Allah be pleased with him) reported that Sa' d b. 'Ubada al-Ansari said: Messenger of Allah, tell me if a man finds his wife with another person, should he kill him? Allah' s Messenger (ﷺ) said: No. Sa' d said: Why not? I swear by Him Who has honored you with the Truth. There upon Allah' s Messenger (ﷺ) said: Listen to what your chief says.
Sahih Muslim 1498a