Augustine of Hippo
Concerning the unbelievers, they were like a generation uprooted and hardened. Just as they were consuming the food, the anger of God descended upon them, striking down the majority. Although some versions suggest “the thickest of them,” this phrasing has not been found in the Greek texts available. If this were indeed the more accurate interpretation, it would signify those who are filled with pride, as it is written, "Their iniquity shall come forth as if from a tuk." Meanwhile, the chosen of Israel were held back. There were indeed those chosen who did not mix their faith with the twisted and bitter generation. Yet, they were hindered from doing any good for those they wished to aid out of a loving paternal instinct. What can human compassion offer to those whom God rebukes?
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Or perhaps it was to illustrate how the elect were simultaneously restrained alongside them, such that those who were distinct in thought and action might endure suffering together, serving as an example of not only righteousness but also of steadfastness. It has been observed that the holy individuals were taken captive alongside sinners for this very purpose; for in the Greek texts we discover not the term ἐ νεπόδισεν, meaning constrained, but rather συνεπόδισεν, which indicates constrained together with.