Because Ephraim has multiplied altars for sinning, altars have been to him for sinning.

The more [the prophets] called them, the more they went from them. They sacrificed to the Baalim, and burned incense to graven images.

And I will visit upon her the days of the Baalim, to which she burned incense when she decked herself with her earrings and her jewels, and went after her lovers, and forgot me, says LORD.

They sacrifice upon the tops of the mountains, and burn incense upon the hills, under oaks and poplars and terebinths, because the shadow of it is good. Therefore your daughters play the harlot, and your brides commit adultery.