Question: I hear and see with my own eyes, that people say that Awliyaa’ (pious people) have authority over people in worldly life and they also claim that they have forty forms; sometimes you see them in the form of a man, sometimes a snake, or a lion etc. They go to graveyards and sleep there, and then they set out at nightfall. People relate that they stand near them in sleep and tell them, “Go, you are cured.” Is such talk true or not?
Answer: Awliyaa’ have no authority over anyone; whatever Allaah has given them is merely the ordinary means given to all other humans. They do not have supernatural powers; they cannot take non-human forms, like snakes, lions, monkeys or other animals… read more here.