1 Kings 12:28-33

²⁸So the king consulted, and he made two golden calves; and he said to the people, “It is too much for you to go up to Jerusalem; behold your gods, Israel, that brought you up from the land of Egypt.” ²⁹And he set up one in Bethel, and the other he put in Dan. ³⁰Now this thing became a sin, for the people went to worship before the one as far as Dan. ³¹And he made houses on high places, and appointed priests from all the people who were not of the sons of Levi. ³²Jeroboam also instituted 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 he did in Bethel, sacrificing to the calves which he had made. And he stationed in Bethel the priests of the high places which he had made. ³³Then he went up to the altar which he had made in Bethel on the fifteenth day in the eighth month, the month that he had devised in his own heart; and he instituted a feast for the sons of Israel and went up to the altar to burn incense.