The Most Ancient Lives of Saint Patrick/The Life and Acts of St. Patrick/Chapter 119
Certain Cheeses are converted into Stones, and many Wicked Men are drowned.
And certain wicked and envious men, who lived in the country of Ferros, contriving to destroy the life of the saint, offered unto him poisoned cheeses, as if for his benediction; the which he blessed, and immediately converted into stones, to the admiration of many, the honor of God, the veneration of himself, and the confusion of the poisoners. And unto this day remain these stones in the place where the miracle was done, and show the virtue of Patrick, though mute, because they underwent mutation. Then did these poisoners, seeing that their machinations redounded to the glory of the saint and to the shame of themselves, gather together fifty armed men to spill the blood of this just one. And they, being assembled against him, entered the ford of a certain river, journeying along the bank whereof the man of God met them; and when he beheld their countenances, he understood their thoughts, and raising against them his left hand, with a clear voice he cried out, "Ye shall not come unto us, nor shall ye return unto your own people, but in this river shall your bodies remain, even to the day of judgment." Then, according to the word of the man of God, immediately they sank as lead in the mighty waters; nor even to this day were their bodies found, though long and often sought. Thus, at the divine mandate, did the water punish them who conspired the death of Saint Patrick, as erewhile the fire from heaven punished them which were sent by King Achab to the prophet. And the place wherein they sank in the waters is called even to this day the Ford of the Drowned Men.