Amos 2:6

He does not leave him unpunished, but rather subjects to punishments Israel, that is, the tribes in Samaria. And that they themselves, sinning unguardedly, have all but consumed the tranquility owed by God to the weak, the turning away for three and four sins would show, which having suffered they must necessarily be subjected to terrible things, and be in every evil. Therefore, the divine David, fearing this thing, and knowing it to be a cause of destruction, implored, saying, "Do not turn Your face from me, and do not turn away in wrath from Your servant." For wrath always follows, and, as it were, accompanies the turnings away.

Many, truly, are the shoes of the sinful soul, by which it is bound and cramped. For each man is cramped by the cords of his own sins. Accordingly, Abraham swears to the king of Sodom, "I will not take of all that is thine, from a thread to a shoe-latchet." On account of these being defiled and polluted on the earth, every kind of wrong and selfishness engrosses life. As the Lord reproves Israel by Amos, saying, "For three iniquities of Israel, yea, for four, I will not turn him back; because they have given away the righteous for silver, and the needy for a pair of shoes, which tread upon the dust of the ground."

"They sell the righteous for silver, and the needy for a pair of sandals": They did not endure to speak rightly and justly, and to render for each of those being judged the justice that accords with the law. But if it happened that a man was righteous, sober and gentle, modest and unboastful; for such a one would be understood as both righteous and needy, or poor in spirit; being brought to judgment by one of the more powerful, this man is sold to his enemies, although the law clearly proclaimed, "You shall not take person in judgment;" and again, "You shall not slay the innocent and the just." For the one entrusted with judging is certainly established in the order of God, to whom alone judging is proper. "For there is one lawgiver and judge," according to the voice of the saint. Therefore, the one who falsifies the account of justice and shows partiality will certainly insult the divine dignity, and offends God who says, "Execute true judgment, and show mercy and compassion every one to his brother." He accuses them, therefore, of selling the just and the needy to their enemies, and of being accustomed to doing this for the sake of a few and most worthless gains, which would scarcely suffice for those who received them for the purchase of sandals.

He might also have been betrayed by any stranger, did I not find that even here too he fulfilled a psalm: "He who did eat bread with me has lifted up his heel against me." And without a price might he have been betrayed. For what need of a traitor was there in the case of one who offered himself to the people openly and might quite as easily have been captured by force as taken by treachery? This might, no doubt, have been well enough for another Christ but would not have been suitable in one who was accomplishing prophecies. For it was written, "The righteous one did they sell for silver." The very amount and the destination of the money, which on Judas's remorse was recalled "from its first purpose of a fee" and appropriated to the purchase of a potter's field, as narrated in the Gospel of Matthew, were clearly foretold by Jeremiah: "And they took the thirty pieces of silver, the price of him who was valued, and gave them for the potter's field."

Thus saith the Lord, for three transgressions of Israel,....