And when he was gone, a lion met him by the way, and slew him: and his carcase was cast in the way, and the ass stood by it, the lion also stood by the carcase. A lion met him - and slew him - By permitting himself to be seduced by the old prophet, when he should have acted only on the expressly declared counsel of God, he committed the sin unto death; that is, such a sin as God will punish with the death of the body, while he extends mercy to the soul. See my notes on 1 John 5:16 (note), 1 John 5:17 (note).
From the instance here related, we see, as in various other cases, that often judgment begins at the house of God. The true prophet, for receiving that as a revelation from God which was opposed to the revelation which himself had received, and which was confirmed by so many miracles, is slain by a lion, and his body deprived of the burial of his fathers; while the wicked king, and the old fallen prophet, are both permitted to live! If this was severity to the man of God, it was mercy to the others, neither of whom was prepared to meet his judge. Here we may well say, "If the righteous scarcely be saved, where shall the ungodly and the sinner appear?"