John Chrysostom
Let us see, then, whether He spared the Israelites when they proved unworthy of His gifts. No. Therefore the Apostle adds: "But with many of them God was not well pleased."
Although God counted them worthy of such honor, it brought them no benefit, and most of them perished. They all perished. Yet lest the Corinthians think that universal destruction awaited them also, the Apostle said, "many."
They formed an innumerable multitude, but their multitude did not help them at all. All the benefactions were a sign of God's love, yet even this did not help them, because they themselves did not show works of love.
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Since many do not believe the teaching about Gehenna, because it is intangible and invisible, the Apostle proves from past examples that God punishes sinners, even if He had earlier poured countless benefactions upon them.
If you do not believe what is to come, he says, surely you will not disbelieve what has passed. See how many benefactions God bestowed on them.
He freed them from Egypt and its bondage. He led them through the sea. He sent down manna from heaven. He caused new and wondrous springs of water to flow.
He continually accompanied them, working miracles and protecting them everywhere. Yet when they proved unworthy of such gifts, He did not spare them, but destroyed them all.
"For they were struck down in the wilderness," says the Apostle. By this expression he shows their sudden destruction, the sufferings and punishments sent upon them by God, and the fact that they did not receive the rewards set before them.
Moreover, He did not send all this upon them in the promised land, but outside it, and very far from it. He punished them with a twofold punishment: He did not allow them to see the promised land, and He chastised them severely.
But how, you will say, does this apply to us? It applies precisely to you.