Matthew Poole and continuators on 1 Kings 12:30

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

i. e. A cause or occasion of great wickedness among that People; not onely of Idolatry, which is called Sin by way of Eminency; not onely of the Worship of the Calves, wherein they pretended to worship the True God; but also of the Worship of Baal, and of the utter desertion of the True God; and of all sorts of impiety, and abominable Sins; as is manifest from the History of that Kingdom: in which, there was not one good King: and very few of the people who were not guilty of hainous Crimes, as the Prophets witness.

The Kings Counsel and Example seduced them, though it did not excuse their Sin; and they willingly walked after this his wicked commandment, Hos. 5. 11.

Which is not here mentioned exclusively, for that they went also to Bethel is evident from ver. 32, 33. but for other reasons, either because that of Dan was first made, or best frequented, the people in those parts having been long leavened with Idolatry: See Iudg. 18. 30. or to shew the peoples readiness to comply with the King's Command, and their Zeal for Idols; that those who lived in, or near Bethel, had not patience to stay till that Calf was finished, but all of them were forward to go as far as Dan, which was in the utmost borders of the Land, to Worship an Idol there; when it was thought too much for them to go to Ierusalem to Worship God.

Marginal references: Heb. of the Calves.