In Matthew 7:22-25, we see a startling passage of scripture:
Jesus says, “Many will say to Me on that day, ‘Lord, Lord, have we not prophesied in Your name, cast out demons in Your name, and done many wonderful works in Your name?’ But then I will declare to them, ‘I never knew you. Depart from Me, you who practice evil.'”
People were casting out demons in His name, but He called them evildoers. Jesus was speaking of the false deliverance ministers who prey on desperate people, causing them to end up worse after their encounter than they were before.
This video breaks down the danger. Watch it.