Ah, just like I thought.
2 seconds sound clip from the The Treasure of the Sierra Madre movie soundboard.
You can hear this line at 00:48:21.168 in the Blu-ray version of the movie.
Quote context
[...]
- The two days I'd be gone would give you plenty of time to discover where my goods are, wouldn't it?
- If you feel along those lines, why don't you take your goods along with you?
- And run the risk of having them taken from me by bandits?
- All right, Dobbs. Forget about it.
- I think I'm going to haul off and pump you up, chest and belly alike.
- Go ahead, but would you mind telling me what this is all about first?
[...]