Because Ephraim has been increasing altars for sin, altars have become a cause of sin to him.

Then all the people of the land went to the house of Baal and had it pulled down: its altars and images were all broken to bits, and Mattan, the priest of Baal, they put to death before the altars. And the priest put overseers over the Lord's house.

And the altars on the roof of the high room of Ahaz, which the kings of Judah had made, and the altars which Manasseh had made in the two outer squares of the house of the Lord, were pulled down and crushed to bits, and the dust of them was put into the stream Kidron.

Then all the people went to the house of Baal and had it pulled down, and its altars and images broken up; and Mattan, the priest of Baal, they put to death before the altars.