Cyrill of Alexandria
But Holy Scripture refers to the church as the mountain of Zion, as it is truly elevated and oversees all things, sanctified as the dwelling place and city of the most holy God. The foolish Idumean believed he would inherit the house of Jacob, meaning the descendants of Jacob, and had already divided the territory, rendering it desolate alongside the Chaldeans. However, he will discover that the situation will drastically change for them, as they themselves will become the possession of Jacob’s descendants and will be consumed like chaff in the fire. The house of Jacob shall become a blaze, yet the house of Joseph shall not yield to any conflagration. Thus, they shall face complete destruction, rendering them so diminished that not a single spark can be found among them.
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The prophetic utterance seems to employ the term fire-bearer, indicating this shift; for by fire, it designates the house of Jacob and by flame, the house of Joseph. The house of Jacob could rightly refer to the descendents of Judah and Benjamin, while the house of Joseph may denote the inhabitants of Samaria or the ten tribes, whose rulers were often from Ephraim, and both Ephraim and Manasseh were descendants of Joseph.
The phrase about inheriting those who dwell in Nagevah (Agebah) carries this meaning. When the Babylonians departed their homeland to besiege Jerusalem, and Nebuchadnezzar battled against them, it resulted in widespread devastation that ultimately left the region in utter ruin and stripped of its people. Nevertheless, upon God's mercy for them and their deliverance from captivity, they returned to their homeland. Thus, He declares His intention to spread them out, causing them to become a vast multitude, capable of possessing the lands of neighboring nations, while Idumea would be justly constrained. A clear sign of divine blessing is this: those in Nagev, meaning those dwelling to the south, shall inherit the mountain of Esau, signifying Idumea; for it, located in the south, will be wholly claimed by the inhabitants from the southern part of Judah.
Those who reside in the lowlands, indicating those who dwell in the northernmost plains of Judah, shall inherit the strangers, specifically the Philistines or Palestinians. They will also possess the cities of Ephraim, Samaria, Benjamin, and Gilead. These territories were once bequeathed to the tribes of Israel under the leadership of Jesus, the successor of Moses. However, since these areas had been desolated prior to Nebuchadnezzar's arrival due to the Assyrians and the reigns of kings Tulo and Salmanassar, it is foretold that these lands will be inhabited again and no longer remain a wasteland as they had before.