Yechezkel 33:32-33

Orthodox Jewish Bible

³² And, hinei, thou art unto them nothing more than one with a kol yafeh (beautiful voice) who sings shir agavim (sensual love songs) and can play well on a musical instrument; for they hear thy devarim, but they do them not.

³³ And when this cometh to pass‖hinei, it will come‖then shall they know that a navi hath been among them.