Salmos 2

Salmos 2:11

Even your very rejoicings therefore ought to be done with fear and trembling, for a Christian who is faithful ought to repeat neither a heathen hymn nor an obscene song, because he will be obliged by that hymn to make mention of the idolatrous names of demons; and instead of the Holy Spirit, the wicked one will enter into him. — CONSTITUTIONS OF THE HOLY APOSTLES 5:2.10