No need, I've done it myself.
3 seconds sound clip from the Strife for Mastery (1978) movie soundboard.
You can hear this line at 01:18:44.327 in the DVD version of the movie.
Quote context
[...]
- Ha ha ha ha ha! That's true. And that did help.
- A good man can easily deceive.
- You know, you aren't a bad man, though, because you're not a man. You're the worst kind of animal.
- You can curse me because you haven't got much time left to curse.
- You see, the wine that you just drank was poisoned, and you'll soon die, like your dad.
- No need, I've done it myself.
- From now onwards, I shall be the new Lord Wong and head of the swordsmen.
- All killers eventually have to forfeit their lives.
[...]