1 Kings 12:30

28So the king took counsel, and made two calves of gold; and he said to them, “It is too much for you to go up to Jerusalem. Look and behold your gods, Israel, which brought you up out of the land of Egypt!”

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

30This thing became a sin, for the people went even as far as Dan to worship before the one there.

31He made houses of high places, and made priests from among all the people, who were not of the sons of Levi.

32Jeroboam ordained a feast in the eighth month, on the fifteenth day of the month, like the feast that is in Judah, and he went up to the altar. He did so in Bethel, sacrificing to the calves that he had made, and he placed in Bethel the priests of the high places that he had made.