The king of Israel told Jehoshaphat, “We can ask the Lord through Micaiah, son of Imlah, but I hate him. He doesn’t prophesy anything good about me, only evil.” Jehoshaphat answered, “The king must not say that.”
But if you warn a wicked person to turn from his ways and he doesn’t turn from them, then he will die because of his sin. However, you will save yourself.