1 Kings 12:31 WEB

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

³⁰  This thing became a sin; for the people went [to worship] before the one, even to Dan.

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

³²  Jeroboam 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; so did he 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.

³³  He went up to the altar which he had made in Bethel on the fifteenth day in the eighth month, even in the month which he had devised of his own heart: and he ordained a feast for the children of Israel, and went up to the altar, to burn incense.