John Calvin on Numbers 17:5-7

5. And it shall come to pass, that the man’s rod. Aaron, indeed, had been previously chosen; but the expression here refers to his manifestation; Fr., “A la seconde declaration.” because God is said again to choose those, whom He has chosen by His secret counsel, when He brings them forth into the sight of men with their peculiar marks of distinction; and this not once only, but as often as he confirms their election by new indications. And this seems to be spoken of by way of concession, as if God would pass over all His former decrees, and invite the people afresh to take cognizance of the matter. With this view tie states that He will put an end to all the malevolent and noisy detractions of the people, so that Aaron may henceforth exercise his office without controversy; for, although not even thus was their perverseness altogether cured, still their insolence was restrained.