Amigo, that's the one answer that would prove you're all right.
6 seconds sound clip from the For a Few Dollars More movie soundboard.
You can hear this line at 01:07:27.594 in the Blu-ray version of the movie.
Quote context
[...]
- They told me you were put away. You'd be resting for four long years in prison.
- No, Indio, for four weeks. No more than four weeks.
- He got me out. The man's a friend of mine.
- Why did he help you? Did you ask him that?
- Yeah. Amigo, why did you help me out?
- Amigo, that's the one answer that would prove you're all right.
- Not far from El Paso there's a little town, Santa Cruz.
- Tomorrow, Blackie, Chico, Paco... and you, amigo... will rob the bank in Santa Cruz.
- Shoot, kill, get every gun in the area after you. Especially those from El Paso.
- Any others around, we'll take care of them.
[...]