This is the reason why the Prophet says that the wickedness of Israel was Samaria, that thence arose all iniquities. But we must at the same time bear in mind, that the Prophet speaks not here of gross crimes; but, on the contrary, he directs his reproof against ungodly and perverted forms of worship; and this appears more evident from the second clause, in which he mentions transgressions in connection with the high places. We hence see, that all sins in general are not here reproved, but their vicious modes of worship, by which religion had been polluted among the Jews as well as the Israelites. But it might seem very unjust, that the Prophet should charge with sin those forms of worship in which the Jews laboriously exercised themselves with the object of pacifying God. But we see how God regards as nothing whatever men blend with his worship out of their own heads. And this is our principal contest at this day with the Papists; we call their perverted and spurious modes of worship abominations: they think that what is heavenly is to be blended with what is earthly. "We diligently labour," they say, "for this end -- that God may be worshipped." True; but, at the same time, ye profane his worship by your inventions; and it is therefore an abomination. We now then see how foolish and frivolous are those delusions, when men follow their own wisdom in the duty of worshipping God: for the Prophet here, in the name of God, fulminates, as it were, from heaven against all superstitions, and shows that no sin is more detestable, than that preposterous caprice with which idolaters are inflamed, when they observe such forms of worship as they have themselves invented.
Now with regard to the "high places", we must notice, that there was a great difference between the Jews and the Israelites at that time as to idolatry. The Israelites had so fallen, that they were altogether degenerated; nothing could be seen among them that had an affinity to the true and legitimate worship of God: but the Jews had retained some form of religion, they had not thus abandoned themselves; but yet they had a mixture of superstitions; such as one would find, were he to compare the gross Popery of this day with that middle course which those men invent, who seem to themselves to be very wise, fearing, forsooth, as they do, the offenses of the world; and hence they form for us a mixture, I know not what, from the superstitions of the Papacy and from the Reformation, as they call it. Something like this was the mixture at Jerusalem. We however see, that the Prophet pronounces the same sentence against the Jews and the Israelites and that is, that God will allow nothing that proceeds from the inventions of men to be joined to his word. Since then God allows no such mixtures, the Prophet here says that there was no less sin on the high places of Judea, than there was in those filthy abominations which were then dominant among the people of Israel.
- John Calvin, Commentary on Micah (emphases added)
John Calvin also writes,
"All things considered, certainly it is no small condemnation of us to behold what an ardent zeal the holy martyrs had in the past, especially in comparison with the nonchalance we demonstrate. For as soon as a poor man of that time got so much as a little taste of the true knowledge of God, he did not hesitate to expose himself to the danger involved in confessing his faith.He would have preferred to be burned alive than to go so far as to commit some outward act of idolatry."
"But such is the corrupt nature of man, that there is scarce any thing whereabout men have been more apt to contend with God from the foundation of the world. That their will and wisdom may have a share (some at least) in the ordering of his worship, is that which of all things they seem to desire. Wherefore, to obviate their pride and folly, to his asserting of his own prerogative in this matter, he subjoins severe interdictions against all or any man's interposing therein, so as to take away any thing by him commanded, or to add any thing to what is by him appointed. This also the testimonies recited fully express. The prohibition is plain, "Thou shalt not add to what I have commanded.'" - John Owen, Concerning Liturgies and Their Imposition (emphases added), on the Puritan Hard Drive.