Ezekiel 33:30-33

30“But as for you, son of man, your people who talk about you by the walls and in the doorways of the houses say one to another, every one to his brother, ‘Come now and hear what the message is that comes from the Lord.’

31They come to you as people come, and they sit before you as My people, and they hear your words, but they do not practice them; for with their mouth they express loving devotion, but their heart goes after their (unlawful) gain.

32Behold, you are to them like a love song by one who has a pleasant voice and plays well on a stringed instrument [merely to entertain them]; for they hear your words but do not practice them.

33So when it comes to pass—as it most certainly will—then they will know [without any doubt] that a prophet has been among them.”