"For in the day that I visit the transgressions of Israel on him, I will also visit the altars of Bethel; And the horns of the altar will be cut off, And fall to the ground.
Now Bethel is where they had established the worship of the cow, the calf worship in Israel. As Jeroboam had set up the calf in Bethel, and in Dan, and the places for false gods in Gilgal and all, and the people were idolatrous and worshiping these other gods, so now God is speaking out against the altars they had built at Bethel. "In the day that I visit the transgressions of Israel upon him I will also visit the altars of Bethel."