Jer 5:7

“(Vers. 7) How can I be propitious to you? Your sons have forsaken me, and they swear by those who are not gods. I have satisfied them, and they have committed adultery, and they have indulged in the house of a prostitute. Catalogue of the sins of Jerusalem: while she says that she does not know God, by whom she can be shown mercy. Your sons have forsaken me, she says. Not my sons, but yours: they swear by those who are not gods, I have fed them and they have committed adultery. Let those who received wealth from the Lord listen to this and serve luxury.”

“We must conduct our festivals and rejoice with fear and trembling. A faithful Christian, the psalm says, must not sing the songs of the heathen or have anything to do with the principles and doctrines of strange assemblies. It may happen that through their songs, he might make mention of the names of idols, which God forbids the faithful to do. The Lord scolds certain people through Jeremiah and says, "Your children have forsaken me, and have sworn by those who are no gods."”