“He will perish here with those who have no discipline; and he will be driven out of the abundance of his fatness.” One who becomes the prey of sin and lacks discipline will experience the same things. Indeed the one who consorts with murderers becomes a murderer. See what bitter kind of death he [Solomon] designates when he says that he [the wicked person] will die with such companions. It is indeed horrible to depart from life with a bad reputation. Depravity—what he [Solomon] calls “fatness”—multiplies so that the flesh is destroyed completely by the works of flesh, keeping one away from the very kind of life that could save him. He [the wicked person] perishes because of imprudence, not because of lustful desires: he had a legitimate means to satisfy his desire, that is, his wife. Therefore nobody is allowed to accuse nature, but only human intemperance which is not proper to nature.
He will die because he lacked discipline, etc. Because he had disputed much about adulterers or heretics, as is his custom, he shows in the close of his narrative what the end of such people is; that is, they tend towards eternal death, who have hated the discipline of life. He calls it the multitude of folly, when heretics consider themselves wiser than the holy Fathers, or when the wicked, doing the works of darkness, either think the Lord does not see these things or believe they can easily endure His wrath.
[AD 407] John Chrysostom on Proverbs 5:23