1 Kings 12:30-32
International Standard Version
30 Doing this was sinful, because the people traveled as far as Dan to appear before one of their idols.[a] 31 Jeroboam[b] built temples on the high places, and appointed his own priests from the fringe elements of the people who were not descendants of Levi.
32 Jeroboam invented a festival for the fifteenth day of the eighth month similar to the festival that takes place in Judah. He approached the altar that he had set up in Bethel and sacrificed to the calves that he had made, having stationed in Bethel the priests that he had appointed.Read full chapter