- He lives with the rats.
- More specifically, he's the leader of the rats.

— Mrs. Brisby (Elizabeth Hartman), Mr. Ages (Arthur Malet)

3 seconds sound clip from the The Secret of NIMH (1982) movie soundboard.

You can hear this line at 00:38:13.553 in the Blu-ray version of the movie.

Quote context

[...]

- But I must see Nicodemus. The Owl told me to see Nicodemus. Yes, perhaps you should...

- The Owl said? Here now, what owl? What are you talking about?

- I went to see the Great Owl.

- The Owl? You say you saw the Owl?

- Yes.

- And he said I should ask for Nicodemus.

- I know Nicodemus.

- He lives with the rats.

- More specifically, he's the leader of the rats.

- You know him?

- No one has ever seen the Owl! And lived to tell about it.

- Please, could you take me to see Nicodemus?

- Yes. Yes, but for your sake, I hope you're telling the truth. Come on.

- What about the large rat at the entrance? I can't go back there. I can't.

[...]