1 Kings 12:30-32
Complete Jewish Bible
30 and the affair became a sin, for the people went to worship before the one [in Beit-El and] all the way to Dan [to worship the other]. 31 He also set up temples on the high places and made cohanim from among all the people, even though they were not descended from Levi.
32 Yarov‘am instituted a festival in the eighth month, on the fifteenth day of the month, similar to the festival held in Y’hudah; he went up to the altar in Beit-El to sacrifice to the calves he had made; and he placed in Beit-El the cohanim he had appointed for the high places.Read full chapter