Ephrem the Syrian, on 2Kgs 3:26

“And when the king of Moab saw this, to wit, that the enemies had prevailed, he took with him seven hundred men that drew the sword, to break in upon the king of Edom: but they could not.”

“Therefore Mesha, who had lost all his hope in his armies, made an about-face to ask the gods for help, because he had seen that no human being could help him. Certain wise men of his country said to him that it was necessary to implore the mercy of the God of Israel by means of an extraordinary sacrifice, for exactly the same reason which Abraham, the father of the Israelites, had made his offering, which had been quite pleasing to God, according to the tradition that is generally renowned among the Canaanites. But the power and the strength of God had already been recognized by all with great admiration for what he had done before all the Moabites. Indeed, no one but him had made the water flow on his people in the desert of Edom, and they had never heard of or known another God who granted his worshipers greater benefits. Therefore the king, who could not deny the miracle that he had seen with his own eyes, did not want to be deprived of sufficient aid in the difficulties that encircled him. He was confirmed [in his hope] and abandoned the worship of idols by taking refuge in the powerful God who had created a new sea in the desert. Therefore he was invited by the word of the wise men and nobles of Moab to make a great sacrifice and to offer his firstborn child, the pillar of his house and the hope of his kingdom, on the city walls, before the armies that besieged him. He wanted the Hebrew to see the sacrifice he was about to make to the God of Abraham according to the teaching of Abraham.And then the wrath against the Israelites increased, because the calamities, which the Scripture accurately relates after these events, happened to them again. They had seen how God protected them, and the abundance of water that he had made miraculously flow for them and the retreat of their enemies before them. Nevertheless, they persisted in their dishonor, and their hearts were still attached to their calf.”

Imported from an open dataset — not yet checked against the printed edition.