The magicians told their victim that he had been put under a spell, and that he would die in two months. In other words, they told him outright lies. If anyone goes to magicians (or astrologers or fortunetellers) and is told that a spell has been put on them and so on, they can be sure this is a lie. They told him these lies in order to fleece him of his money. If you go to magicians, they’ll lie to you and fleece you as well.