Now therefore listen to the word of Yahweh: 'You say, Don't prophesy against Israel, and don't preach against the house of Isaac.'
Now, when he says, Prophecy not against Israel, and speak not against the house of Isaac, we may learn again from these words, that the word Isaac is used by the Prophet by way of concession; for the people of Israel were then wont to adduce the example of this holy patriarch. Thus superstitious men, neglecting the law of God, the common rule, ever turn aside to the examples of the saints; and they do this without any discrimination; nay, as their minds are perverted, when anything has been wrongfully done by the fathers, they instantly lay hold on it: and then, when there is anything peculiar, which God had approved in the fathers but wished not to be drawn, as they commonly say, into a precedent, the superstitious think that they have the best reason in their favor, when they can set up such a shield against God. As, then, the Israelites had at that time the name of their father Isaac in their mouths while they were foolishly worshipping God in Bethel and in other places, contrary to what the law prescribed, the Prophet Amos designedly repeats here again the name of Isaac, expressing it probably in imitation of what had been said by Amaziah. 