Exodus 40:17

17.And it came to pass in the first month In all the arrangements, which are here described, it must be especially noted, that Moses obeyed God in such a manner as not to vary in the most trifling point from the form prescribed to him. He therefore so frequently enforces the fact, that he did as God had commanded him; and not without reason, for there is nothing to which men are more prone than to mix up their inventions with God’s commands, as if they would be wiser than He is. In order then that the people might know that there was nothing of human invention in all the legal service, Moses so carefully insists on this point, and so often testifes to his obedience. But if so great the Prophet dared to attempt nothing of himself in trifling matters, how great is the audacity and arrogance of those men who arbitrarily invent innumerable figments, whereby God may be worshipped! Let us, however, learn from this passage to embrace with reverence whatever has proceeded from God, whilst we reject whatever men advance of themselves.