Powerful story, norsky. There is a Scripture about some demons only coming out after fasting and praying. I think it’s in Luke, but even some Bibles have removed it. Let me do a little digging.
Mark 9:29
He replied, “This kind can come out only by prayer and fasting.”
Many more modern translations have removed “and fasting.”
The traditional interpretation of Jesus’ explanation of this verse has this particular “kind” of demon being so powerful that the disciples would not be able to drive it out, and that only prayer to God would result in the boy’s healing.