John Wesley on Isaiah 14:29

Of him - Most understand this of Uzziah, who did then much mischief, 2Chron 26:3,6. But he was dead thirty - two years before this time, and therefore their joy for his death was long since past. Others understand it of Ahaz: but he was so far from smiting them, that he was smitten by them. We may understand this of the royal race of Judah, who had been a terrible scourge to them, whose rod might be said to be broken, because that scepter was come into the hands of slothful princes. A serpent - From the root of David shall come Hezekiah, who, like a serpent, shall sting thee to death, as he did, 2Kings 18:8.