1 Kings 12:30 in the World English Bible
This thing became a sin, for the people went even as far as Dan to worship before the one there.
Context
29 And he set the one in Beth-el, and the other put he in Dan.
30 And this thing became a sin: for the people went to worship before the one, even unto Dan.
31 And he made an house of high places, and made priests of the lowest of the people, which were not of the sons of Levi.