You see, you should never kill a man unless it's absolutely necessary.
5 seconds sound clip from the Bronco Billy movie soundboard.
You can hear this line at 00:38:21 in the Blu-ray version of the movie.
Quote context
[...]
- What did he do to make you so mad, Bronco Billy?
- He talked dirty about my mother.
- So you killed one-eyed Charlie?
- Well, I didn't kill him, but I shot his holsters right off his hips.
- You see, you should never kill a man unless it's absolutely necessary.
- May I speak with you for a moment?
- Sure. See you in a little bit.
- Thanks for the show, Bronco Billy.
- You promised to take me to the next town.
- Deal.
[...]