Well, it's a stylized ritual... in which the, uh, rabbi or the priest try to drive out the so-called invading spirit.
12 seconds sound clip from the The Exorcist movie soundboard.
You can hear this line at 01:09:41 in the Blu-ray version of the movie.
Quote context
[...]
- Would you just name it, for God's sakes? What is it?
- Do you have any religious beliefs?
- No.
- No. Why?
- Have you ever heard of exorcism?
- But... it, uh, has worked, in fact... although not for the reasons they think, of course.
- It's purely force of suggestion.
- You're telling me that I should take my daughter to a witch doctor. Is that it?
[...]