More from Calvin.
Commentary Jeremiah 7:31
"Which I commanded them not, and which never came to my mind This reason ought to be carefully noticed, for God here cuts off from men every occasion for making evasions, since he condemns by this one phrase, "I have not commanded them," whatever the Jews devised. There is then no other argument needed to condemn superstitions, than that they are not commanded by God: for when men allow themselves to worship God according to their own fancies, and attend not to his commands, they pervert true religion. And if this principle was adopted by the Papists, all those fictitious modes of worship, in which they absurdly exercise themselves, would fall to the ground. It is indeed a horrible thing for the Papists to seek to discharge their duties towards God by performing their own superstitions. There is an immense number of them, as it is well known, and as it manifestly appears. Were they to admit this principle, that we cannot rightly worship God except by obeying his word, they would be delivered from their deep abyss of error. The Prophet's words then are very important, when he says, that God had commanded no such thing, and that it never came to his mind; as though he had said, that men assume too much wisdom, when they devise what he never required, nay, what he never knew. It is indeed certain, that there was nothing hid from God, even before it was done: but God here assumes the character of man, as though he had said, that what the Jews devised was unknown to him, as his own law was sufficient."
Commentary Jeremiah 32:35
"He at last says, that he had commanded no such thing, and that it never came to his mind We have said elsewhere, that whenever this manner of speaking occurs, God cuts off every handle from objectors, because the superstitious ever have something to allege as a pretense when they are summoned to an account. We know that the Papists, by pretending good intentions, confidently glory against God; and they think that this one pretense is sufficient to defend them against all reproofs; and they think also that the servants of God and the Prophets are too morose and scrupulous when such an excuse does not satisfy them. But God, that he might not tediously contend with the superstitious, assumes this principle, -- that whatever they attempt beyond the Law is spurious, and that, therefore, the inventions of men cannot be defended by any disguise or pretense. Let us then know that true religion is always founded on obedience to God's will; and hence everything devised by men, when there is no command of God, is not only frivolous, but also abominable, according to what was said yesterday respecting the work of the hands; and so here the command of God is set in opposition to all the inventions of men. But as such declarations often occur, I now touch but slightly on this passage.
This doctrine, however, ought to be especially noticed, that is, that there is no need of a long refutation when we undertake to expose fictitious modes of worship, which men devise for themselves according to their own notions, because, after all that they can say, God in one word gives this answer, that whatever he has not commanded in his Law, is vain and mischievous. He then says, that he had not commanded this, and that it had never entered into his mind.
God in the last clause transfers to himself what applies only to men; for it cannot be said with strict propriety of God, that this or that had not come to his mind. But here he rebukes the presumption of men, who dare to introduce this or that, and think that an acceptable worship of God which they themselves have presumptuously devised; for they seek thus to exalt their own wisdom above that of God himself. And we even find at this day that the Papists, when we shew that nothing has proceeded from the mouth of God of all the mass of observances in which they make religion to consist, do always allege that they do not without reason observe what has been commanded by the fathers, as though some things had come into the minds of men which had escaped God himself! We then see that God in this place exposes to ridicule the madness of those, who, relying on their own inventive wits, devise for themselves various kinds of worship; for they seek, as we have said, to be wiser than God himself. We now, then, perceive the force of the expression, when God says that it never came to his mind, because men boast that it had not been contrived without reason, and glory in their own acuteness, as though they were able to appoint a better thing than God himself.
He afterwards says, That they should do this abomination God now goes farther, and calls whatever he had not commanded an abomination. And this clause confirms what I have before said, that there is no need of long arguments when the question is respecting the inventions of men, for nothing can be approved of in the worship of God but what he has himself commanded. Whatever therefore has proceeded from the notions of men, is not only frivolous and useless, but it is also an abomination; for God so represents it in this place. It is therefore not enough at this day to repudiate and to treat with disdain the fictitious modes of worship in which the Papists so much glory; but if we would prove that we have a true zeal for religion, we must abominate all these fictitious things; for God has once for all declared them to be abominable."
Many examples have been given. Here is another one that has not been given (though examples are not needed). Consider how David sought to bring up the ark the first time. Uzza dies. They were transporting the ark in the wrong manner, and Uzza presumptuously assumed that necessity would require him touching the ark to keep it from falling. However, there were other irregularities, which can be seen by comparing the first attempt with the second attempt (e.g., Levites and they only are playing the musical instruments in the second attempt). Bringing up the ark was not something that had a command associated with it, aside from the Levites needing to be the ones who carried it with the staves made for it. But many other parts of the event are condemned because, as David said, they did not seek the Lord after due order (which they did do for the second attempt).