Ezekiel 33:30-33

30 As for you, son of man, the children of your people talk of you by the walls and in the doors of the houses, and speak one to another, everyone to his brother, saying, Please come and hear what is the word that comes forth from Yahweh.  31 They come to you as the people comes, and they sit before you as my people, and they hear your words, but don't do them; for with their mouth they show much love, but their heart goes after their gain.  32 Behold, you are to them as a very lovely song of one who has a pleasant voice, and can play well on an instrument; for they hear your words, but they don't do them.  33 When this comes to pass, (behold, it comes,) then shall they know that a prophet has been among them.