Cyrill of Alexandria
Once more, he lists the transgressions of the Idumeans, illustrating their cruelty and lack of compassion. The manner of his address suggests that God is speaking to them during a moment of their own suffering and condemning their sins. The term “despise” signifies the act of mocking and taking pleasure in the hardships of brothers, delighting in the misfortunes of others, even though Holy Scripture declares that it is unlawful to laugh at those in distress (Sir 7:11). In saying, “Let not thou rejoice,” he reiterates the offenses of the Idumeans, revealing their mercilessness, particularly towards their brethren. He warns them not to hasten, like the Assyrians, to the city's gates, not to offer aid as brothers would, but instead to bring devastation.
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They must not deride those who are suffering direly; they must not further oppress those already grievously afflicted before them. They should not become traps for the fleeing nor set snares to prevent any who have suffered their indifference from escaping, even if they have eluded the enemy's sword. Throughout, the prophetic voice condemns the inhumanity of the Idumeans, ensuring that divine judgement remains just and beyond reproach as those guilty of such transgressions face righteous punishment.