I have heard that he roams at night and lies up by day in a great cavern beneath the castle, but we'll know soon enough.

7 seconds sound clip from the The Last Unicorn movie soundboard.

You can hear this line at 00:42:39.533 in the Blu-ray version of the movie.

Quote context

[...]

- We are journeying to King Haggard's country to find the Red Bull!

- Well, you're going the wrong way.

- I'm sorry, but you were going the wrong way, magician.

- Well, it was a shortcut.

- Haggard's fortress. We'll be there tomorrow if we walk all night.

- Where does King Haggard keep the Red Bull?

- I have heard that he roams at night and lies up by day in a great cavern beneath the castle, but we'll know soon enough.

- Moon rising, disguising, lonely streets in gay display...

- The stars fade, the nightshade closing makes the world afraid.

- It waits in silence for the sky to explode.

- Here I am, on man's road. Walking man's road...

[...]