1 Kings 12:28-32

28So the king took counsel and made two calves of gold. And he said to the people, "You have gone up to Jerusalem long enough. Behold your gods, O Israel, who brought you up out of the land of Egypt."

29And he set one in Bethel, and the other he put in Dan.

30Then this thing became a sin, for the people went as far as Dan to be before one.

31He also made temples on high places and appointed priests from among all the people, who were not of the Levites.

32And Jeroboam appointed a feast on the fifteenth day of the eighth month like the feast that was in Judah, and he offered sacrifices on the altar. So he did in Bethel, sacrificing to the calves that he made. And he placed in Bethel the priests of the high places that he had made.