The Most Ancient Lives of Saint Patrick/The Life and Acts of St. Patrick/Chapter 60
Of another Magician whom the Earth swallowed up.
And the Lord ordained unto Saint Patrick strong and frequent conflicts with the magicians, that he might conquer and know how prevailing was the wisdom of Him in whose name all their endeavors were foiled. For as, according to the apostle, Iannes and Mambres resisted Moses, so did very many evil-doers resist Patrick. Therefore, on another day, in the place of the aforementioned council, another but not a different evil-doer, at the instigation of Satan, arose with the like fury against the saint, that he might destroy him. But the right hand of the Lord, which erewhile had smote his enemy with consuming fire, was magnified in strength, and in His manifold power swept this evil-doer from the face of the earth. For the earth, cleaving asunder, opened her mouth and swallowed up the magician who had so often defiled himself with so many evil deeds, and, closing again, plunged him into the abyss.