Some thus render the word adm, adam,–”As the covenant of man have they transgressed it,” transferring it to the genitive case, “And they have transgressed the covenants as if it was that of man;” that is, as if they had to do with a mortal man, so have they despised and violated my holy covenant; and this exposition is not very unsuitable, except that it somewhat changes the construction; for in this case the Prophet ought to have said, “They have transgressed the covenant as that of a man;” but he says, ‘They as a man,’ etc. But this rendering is far from being that of the words as they are, ‘They as men have transgressed the covenant.’ I therefore interpret the words more simply, as meaning, that they showed themselves to be men in violating the covenant.
And there is here an implied contrast or comparison between God and the Israelites; as though he said, “I have in good faith made a covenant with them, when I instituted a fixed worship; but they have been men towards me; there has been in them nothing but levity and inconstancy.” God then shows that there had not been a mutual concord between him and the Israelites, as men never respond to God; for he sincerely calls them to himself, but they act unfaithfully, or when they have given some proof of obedience, they soon turn back again, or despise and openly reject the offered instruction. We then see in what sense the Prophet says that they had transgressed the covenant of God as men. Others explain the words thus, “They have transgressed as Adam the covenant.” But the word, Adam, we know, is taken indefinitely for men. This exposition is frigid and diluted, “They have transgressed as Adam the covenant;” that is, they have followed or imitated the example of their father Adam, who had immediately at the beginning transgressed God’s commandment. I do not stop to refute this comment; for we see that it is in itself vapid. Calvin, Commmentary, Hosea 6:7.