Bel bows down, Nebo stoops, their idols were upon the beasts, and upon the cattle: your carriages were heavy laden; they are a burden to the weary beast.
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Cyril of Alexandria
But Bel was also honored in other cities. For they say that Bel was the mythical figure Chronos among the godless Greeks, one who was reputedly cruel and bloodthirsty and loved to slaughter humans … whereas the God of the universe is not pleased with such terrible impieties and through one of the holy prophets he said to those who were accustomed to doing this, “You sacrifice humans, for you have run out of cattle.” … The expression “cast down” is apt, since the prophet here speaks of a time near to his own. For we can read in the books of the Kings that when the former people carried the divine ark to the temple of Dagon, as those worshiping the idol went in, they saw Dagon fallen down in front of the ark. - "Commentary on Isaiah 126.96.36.199"
The prophecy has described those things concerning the conversion of the nations and those concerning the elect of the seed of the sons of Israel, and it now turns once more to address the Jews and intends the complete destruction of idolatry … (following Symmachus, “their idols have become the prey of animals,” that is, cast aside into total destitution). According to the literal sense, this has been fulfilled among us by these very deeds, while according to a spiritual understanding it concerns the heavy and burdensome and diabolic load of deceitful idolatry that used to lie on the souls of people. - "Commentary on Isaiah 2.30"
Bel; perhaps Nimrod, (Calmet) or Saturn, to whom they sacrificed their children. (Worthington)
Nabo, "the oracle "of Belus. The Chaldeans adored statues and beasts. But the Persians worshipped the elements. (Calmet)
Xerxes destroyed the tomb of Belus, after his expedition into Greece. (Arrian vii.) He had there demolished the temples, (Herodotus viii. 109.) pretending (Haydock) that "the world is the house of the gods. "(Cicero, Leg. ii.)
Weariness. The priests affected to be weighed down, as if the god were present. (Baruch vi. 25.) (St. Cyril)
These then are imitations that cannot save those who carry them and are nothing other than burdens for the priests and weigh them down to the point of exhaustion. And when captivity came, these were carried off first of all due to the value of the metals from which they were made, and they were not able to free the souls of those carrying them. For it is not as dumb imitations they had a life and any feeling of pain, but they are figuratively ascribed soul and body parts, though having no feeling and body parts.… So it could be said that this error of idolatry was the greatest burden among the nations, one that pressed its worshipers down into the ground and could not save and, in fact, made their souls captive to the devil and his demons. - "Commentary on Isaiah 13.6"