Because of Judas’s love for money, he opened up the door to Satan, which he gladly took. The result was a betrayal.
Starting from the last verse, a dog and a pig illustrate an unregenerate person. The vomit and mud symbolize a sinful lifestyle. On the one hand, you have the body ejecting something harmful from within, and the other is washed clean from the outside. Both illustrations, the dog and the pig: reflects a person who at one point did 180 degrees through the conviction of the Holy Spirit. However, the person’s change of lifestyle from sin to holiness was only momentary.
A true Christian will never leave the faith because of Jesus’ prayer for His disciples and every future saint that they would never lose their faith.