It's true, the book still possesses the power to send you back, but to us, it is useless!
6 seconds sound clip from the Army of Darkness movie soundboard.
You can hear this line at 00:51:47 in the Blu-ray version of the movie.
Quote context
[...]
- Dung-eating fool! Thou hast doomed us all!
- When thou misspoke the words, the army of the dead awoke!
- Whoa, whoa, whoa, right there, spinach chin.
- You said you could clean this mess up once you got that book.
- You said there was a passage in there that could get rid of this thing and send me back.
- It's true, the book still possesses the power to send you back, but to us, it is useless!
- The evil has a terrible hunger for the Necronomicon and it will come here to get it.
- You wanted the damn book, I got it for ya.
- I did my part, now you send me back.
- Very well. As we are men of our word, we shall honor our bargain.
[...]