- You don't say so?
- Yes, I say so.

2 seconds sound clip from the The Treasure of the Sierra Madre movie soundboard.

You can hear this line at 00:53:40.245 in the Blu-ray version of the movie.

Quote context

[...]

- Listen, brother, I can look at a hill 5 miles away and tell you whether it carries an ounce or a shipload.

- ¿Cuanto?

- 22 pesos.

- If you haven't found anything up there yet, I'll come along with you and put your nose in it.

- There's indications in this valley, lots of indications.

- By tracing the rocks, I find they come from that Ridge up there, washed down by the tropical rain.

- You don't say so?

- Yes, I say so.

(Gunshots)

- So much for those bandits.

- You know, you got to hand it to the Mexicans when it comes to swift justice. Once the federales get their mitts on a criminal, they know just what to do with him.

- They hand him a shovel, tell him where to dig. When he's dug deep enough, they tell him to put the shovel down, smoke a cigarette, and say his prayers. In another 5 minutes, he's being covered over with the earth he dug out.

[...]