"Ephraim endures slander, broken in judgement, because he started to follow after filth." LXX: "Ephraim oppressed his adversary, trampled justice, because he began to pursue vain things." If Ephraim is wicked, and because of his wickedness he will be destroyed, how can it now be said: "Ephraim endures slander, broken in judgement?" For he who endures slander is also broken, his judgement oppressed unjustly, especially when a just cause is stated for which he was given up to captivity. For it follows: 'since he began to leave behind filth', that is, behind the idols which are compared to filth. Therefore, what he says is this: Ephraim is oppressed by the Assyrians, first by Pul, then by Tiglath-pileser (2 Kings 15), and afterwards by Salmanazar; not because they were righteous who oppressed him, and therefore he was handed over to them; but because those who were once my people, when I abandoned them, were handed over to punishment, and in this there seems to be slander, not towards God ("Al." from God), who inflicts just sentence: but towards those who endure torments, while they are handed over to more wicked adversaries. And the Lord brought upon them the cause of contempt in this part, and to be delivered unto the worst, and no judgment to be had toward them: for Ephraim began to go after idols, and to forsake God: for he himself had made golden calves. According to the interpretation of the Septuagint, Ephraim, that is, Jeroboam, oppressed his adversary Rehoboam, that is, the tribe of Judah, and in it he oppressed: because he followed the filthy idols of the Egyptians, and deserted Jerusalem and the temple. The meaning concerning heretics is clear: that with their false sophisms and dialectical art they often suppress churchmen; but when they have done this, they do not follow the purity of true faith, but the filth of lies; who are given over to the devil and his angels and seem to suffer slander and have the truth of judgment broken within them. Thus Israel is laid waste; and all its labors are devastated by the Assyrian conqueror; and the bishop lost God and therefore he is broken in judgment; because he followed idols.
Source: Commentary on Hosea 5:11