1 Kings 12:28-30

Whereupon the king took counsel, and made two calves [of] gold, and 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 he set the one in Bethel, and the other put he in Dan.

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