拿贼拿赃，拿奸拿双

词语解释

赃：赃物；奸：通奸。捉贼要有赃证，捉奸要有成双人证。指问罪要有真凭实据

英语翻译

To catch a thief you must find the stolen goods, to accuse people of adultery, you must catch the adulterers on the scene.