That'll be something for Cantrell to do when he gets here ridin'.

5 seconds sound clip from the Dark Command (1940) movie soundboard.

You can hear this line at 01:03:37 in the Blu-ray version of the movie.

Quote context

[...]

- Well, you're relievin' me of that, and that's fine. Maybe I ought to thank you.

- Cantrell and his guerrillas have been raidin' north, south, east and west, but they ain't been around Lawrence.

- Any of you fuddleheads ever stop to figure out maybe it was because they're afraid to tangle with your late marshal?

- I've had you in my barber chair day after day, and many's the time I've wanted to slit your fool throat from ear to ear.

- Well, I'm glad I didn't know.

- That'll be something for Cantrell to do when he gets here ridin'.

- Well, the point's well taken.

- Ungrateful pack of hyenies.

- Forget it, doc.

- Hey, mister, what's goin' on up there?

[...]