Allāh ﷻ warns believers in the Qur’ān to stay away from bad thinking about people. Many times, what a person assumes has nothing to do with reality, like someone in a dark room who imagines frightening things around him. Speaking out of bad suspicion destroys homes and families and makes others share in this sin. Asking and investigating for marriage or important matters is not bad suspicion, but when you accuse people without certainty, you take a great sin upon yourself.