Matthew Poole and continuators on 1 Kings 13:34

34 And this thing became sin unto the house of Jeroboam, even to cut it off, and to destroy it from off the face of the earth.

Either, an occasion of sin, and means of hardening all his Posterity in their Idolatry: or, a punishment, for so the word sin is oft used. This his obstinate continuance in his Idolatry, after such warnings, was the utter ruin of all his Family.