1 Kings 12:28, 30, 33

Whereupon the king took counsel, and made two calves of gold; and he said unto them, It is too much for you to go up to Jerusalem: behold thy gods, O Israel, which brought thee up out of the land of Egypt.

And this thing became a sin; for the people went to worship before the one, even unto Dan.

And he went up unto the altar which he had made in Beth-el 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 unto the altar, to burn incense.