Adam Clarke on 1 Kings 13:33

Jeroboam returned not from his evil way - There is something exceedingly obstinate and perverse, as well as blinding and infatuating, in idolatry. The prediction lately delivered at Beth-el, and the miracles wrought in confirmation of it, were surely sufficient to have affected and alarmed any heart, not wholly and incorrigibly hardened; and yet they had no effect on Jeroboam!

Made - the lowest of the people priests - So hardy was this bad man in his idolatry that he did not even attempt to form any thing according to the model of God's true worship: he would have nothing like God and truth. In his calves, or rather oxen, he copied the manner of Egypt; and in the formation of his priesthood, he seems to have gone aside from all models. Amongst the worst of heathens, the priesthood was filled with respectable men; but Jeroboam took of the lowest of the people, and put them in that office.

Whosoever would, he consecrated him - He made no discrimination: any vagabond that offered was accepted even of those who had no character, who were too idle to work, and too stupid to learn.