Ezekiel 33:31-33

And they come to you as people come, and they sit before you as my people, and they hear what you say but they will not do it; for with lustful talk in their mouths they act; their heart is set on their gain. And behold, you are to them like one who sings lustful songs with a beautiful voice and plays well on an instrument, for they hear what you say, but they will not do it. When this comes—and come it will!—then they will know that a prophet has been among them.”