Melachim Alef 12:30-32
Orthodox Jewish Bible
30 And this thing became chattat (sin); for the people went to worship before the one, even as far as Dan.
31 And he made a bais for the [idolatrous] high places, and made kohanim of the lowest of the people, which were not of the Bnei Levi.
32 And Yarov`am ordained a chag in the eighth month, on the fifteenth day of the month, like unto the chag that is in Yehudah, and he offered upon the mizbe’ach. So did he in Beit-El, sacrificing unto the agalim (calves) that he had made; and he installed in Beit-El the kohanim of the [idolatrous] high places which he had made.Read full chapter