Deuteronomy 31:21

21. This song shall testify against them as a witness This ode, passing down from father to son, from generation to generation, would rebuke the apostasy of the nation. How in the midst of prevailing idolatry and gross corruption these divine words would be like the utterances of the prophets of the old and the apostles of the new dispensation! Every time the ode was repeated it would reprove and rebuke. In the days of apostate kings, if the song were repeated, how startling the words, “They sacrificed unto devils, not unto God!”