Il digiuno di Giosuè: errore di citazione o corruzione priscillianista?

In the 'Tractatus Paschae', the first of seven tractatus forming part of the corpus of Wuerzburg attributed to Priscillian, the author exorts his community to prepare for the forthcoming Easter Day. He gives his public three exemples to follow: Moses, who fasted for forty days and forty nights and deserved the conversation with God after the passage through the Red Sea; Joshua, who entered the Promised Land with a similar fasting after the passage through the Jordan; and Jesus who, after his baptism, fasted in the desert and defeated evil. In canonical and non-canonical texts we do not find any mention of Joshua's fasting, a circumstance the author forcedly draws with the aim to place the three examples of Moses, Joashua and Jesus in his description of the combination 'fasting-baptism'.