You're wasting your breath. He won't tell us, and he doesn't have to.

7 seconds sound clip from the Indiana Jones and the Last Crusade movie soundboard.

You can hear this line at 00:54:08 in the Blu-ray version of the movie.

Quote context

[...]

- Didn't I warn you not to trust anybody, Dr. Jones?

- I misjudged you, Walter. I knew you would sell your mother for an Etruscan vase, but I didn't know you would sell your country and your soul to the slime of humanity.

- Dr. Schneider, there are pages torn out of this.

- This book contained a map, a map with no names, precise directions from the unknown city to the secret Canyon of the Crescent Moon.

- So it did.

- Where are these missing pages, this map? We must have these pages back.

- You're wasting your breath. He won't tell us, and he doesn't have to.

- It's perfectly obvious where the pages are. He's given them to Marcus Brody.

- Marcus? You didn't drag poor Marcus along, did you? He's not up to the challenge.

- He sticks out like a sore thumb. We'll find him.

- The hell you will.

[...]