1 Kings 13:24

We know that even saintly men have been given over in the flesh to Satan and to great afflictions for some very slight faults, since the divine mercy will not tolerate the very least spot or stain to be found in them on the day of judgment, and purges away in this world every spot of their filth, as the prophet, or rather God himself says, in order that he may commit them to eternity as gold or silver refined and needing no penal purification. "And," he says,"I will clean purge away your dross, and I will take away all your sin; and after this you will be called the city of the just, a faithful city." And again: "Just as silver and gold are tried in the furnace, so the Lord chooses hearts." 18 And again: "The fire tries gold and silver, but man is tried in the furnace of humiliation." And this also: "For the Lord chastens those whom he loves, and he disciplines every son whom he receives." We see a clear instance of this in the case of the prophet and man of God in the third book of Kings who was immediately destroyed by a lion for a single disobedience, in which he was implicated not of set purpose nor by the fault of his own will but by the enticement of another. As the Scripture says of him: "It is the man of God, who disobeyed the word of the Lord, and the Lord delivered him to the lion, and it killed him according to the word of the Lord, which he spoke." The punishment for his present offense and his careless error—together with the reward for his righteousness—for which the Lord gave over his prophet in this world to the destroyer appeared in the moderation and abstinence of the beast of prey, when that most savage creature did not dare even to taste the carcass that was given over to him.

It is not to be imagined that one has been so annihilated by the teeth of a beast that his soul has then been snatched away to infernal punishment, since the same lion who killed his very body guarded it. Even the beast of burden on which the man had been riding was unhurt and with great courage stood in the presence of the wild beast at the destruction of his master. By this miraculous sign it is made clear that the man of God was corrected temporarily even at the point of death rather than that he was punished after death. On this subject the apostle Paul, when he had made mention of certain unpleasant infirmities and death experienced by many, said, "But if we judged ourselves, we should not thus be judged by the Lord. But when we are judged, we are being chastised by the Lord, that we may not be condemned with the world."

Through the words "a lion killed him" [the Scripture] shows that [the lion] strangled and killed him according to God's command. And through the sentence "it did not eat him," it shows that [the animal] was not urged by hunger but acted in compliance with …

Had he never read that man lives not by bread alone? That his death was for the glory of God; for by this it appeared, (1.) That nothing is more provoking to him than disobedience to an express command, though in a small matter, which makes his proceedings against our first parents, for eating the forbidden fruit, the easier to be accounted for.

Slew him - "But why doth God punish a good man so severely for so small an offense?" His sin was not small, for it was a gross disobedience to a positive command.