This Eucharistic miracle was performed directly by Saint Anthony after he was challenged by a certain Bonovillo to demonstrate the truth of the Real Presence of Jesus in the Eucharist. The most ancient biography of Saint Anthony, L’Assidua (The Untiring), carries Bonovillo’s exact words: “Father! I tell you before all these people: I will believe in the Eucharist if my mule, after fasting for three days, adores the Host which you offer him rather than eating the fodder which I give him.” The mule, despite the fact that it was exhausted by hunger, knelt before the Host and refused its food.