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 God’s Messenger heard of that he said, “Are you surprised at Sa'd’s jealousy? I swear by God that I am more jealous than he is and that God is more jealous than I am. Because of God’s jealousy He has prohibited abominations both open and secret. No one is fonder of receiving an excuse than God, on which account He has sent warners and announcers of good news; and no one is fonder of praise than God, on which account God has promised paradise.” (Bukhari and Muslim.)