A young man in Perugia promised the devil, that if he would enable him to attain a sinful object he had in view, he would give him his soul; and he gave him a written contract to this effect, signed in his own blood.
When the crime had been committed, the devil demanded the performance of the promise; and for this purpose led him to the brink of a well, at the same time threatening, that if he did not throw himself in, he would drag him, body and soul, to hell.
The wretched youth, thinking that it would be impossible to escape from his hands, got on the little parapet to cast himself in; but terrified at the idea of death, he told the devil that he had not courage to take the leap, but that if he was determined on his death, he must push him in.
The young man wore a scapular of the Dolors of Mary; the devil therefore said, "Take off that scapular, and then I will push thee in."
But the youth, discovering in the scapular the protection still vouchsafed to him by the Divine Mother, refused to do so, and at length, after much altercation, the devil, filled with confusion, departed; and the sinner, grateful to the sorrowful Mother, went to thank her, and, penitent for his sins, presented as a votive offering to her altar, in the church of Santa Maria la Nuova in Perugia, a picture of what had taken place.
(Source: The Glories of Mary, by Saint Alphonsus de Ligouri)