I'm sorry to do this, but I have no choice.
5 seconds sound clip from the 18 Jade Arhats (1978) movie soundboard.
You can hear this line at 00:53:56 in the DVD version of the movie.
Quote context
[...]
- Are you perhaps Kung Shi-Ya?
- I owe someone a great favor. And I've been asked to replay it. You've been helping me to do that.
- Well, that's your business. But I don't see how I can help you with that.
- Well, this man said that he wants your head.
- I'm sorry to do this, but I have no choice.
- You mean that you want to kill me?
- Killing is forbidden. A true follower of Buddha may not do that.
- But even so, if you should offer to give your head in a contest, I could take that.
- A test of speed. The fastest wins. Do you accept that?
- Well, I accept. And if I should lose, I'll give you my head.
[...]