Al-Mughira told that Sa'd b 'Ubada said, “If I saw a man with my wife I would strike him with the sword, and not with the flat of it.” When Allah's Messenger ﷺ heard of that he said, “Are you surprised at Sa'd’s jealousy? I swear by Allah that I am more jealous than he is and that Allah is more jealous than I am. Because of Allah’s jealousy He has prohibited abominations both open and secret. No one is fonder of receiving an excuse than Allah, on which account He has sent warners and announcers of good news; and no one is fonder of praise than Allah, on which account Allah has promised paradise.” (Bukhari and Muslim.)