16 But as to unbelievers, being a crooked and embittering generation, as it were, while the morsel was yet in their mouths, “the anger of God went up upon them, and it slew among the most of them”: that is, the most of them, or as some copies have it, “the fat ones of them,” which however in the Greek copies which we had, we did not find. But if this be the truer reading, what else must be understood by “the fat ones of them,” than men mighty in pride, concerning whom is said, “their iniquity shall come forth as if out of fat”? “And the elect of Israel He fettered.”
Even there there were elect, with whose faith the generation crooked and embittering was not mixed. But they were fettered, so that they might in no sort profit them for whom they desired that they might provide from a fatherly affection. For what is conferred by human mercy, on those with whom God is angry? Or rather has He willed it to be understood, how that even the elect were fettered at the same time with them, in order that they who were diverse both in mind and in life, might endure sufferings with them for an example not only of righteousness, but also of patience?
For we have learned that holy men were even led captive with sinners for no other reason; since in the Greek copies we read not ἐ νεπόδισεν, which is “fettered;” but συνεπόδισεν, which is rather “fettered together with.”
Source: The Enarrations, or Expositions, on the Psalms (New Advent)