 A hadith in Tibrani says "If a man has married a woman and in his heart he has the intention of not paying that mahr, then he has deceived her.If he dies and he has not paid her right, then on the Day of Judgment he will be presented before Allah as a rapist.And a man who has borrowed money from another man while he did not have the intention of re-paying the debt, then he has deceived him, and consequently he defrauded him.