Dad, you mustn't go after Pai Mei.
4 seconds sound clip from the Executioners From Shaolin (1977) movie soundboard.
You can hear this line at 01:05:57 in the DVD version of the movie.
Quote context
[...]
- Last time, his kung fu was much worse than Pai Mei's. So Pai Mei didn't mind him escaping.
- He didn't... take him seriously. But now, he's improved a lot.
- If Pai Mei wins, he'll make sure that this time, he doesn't escape.
- Dad, you mustn't go after Pai Mei.
- Nonsense. Did your mom ask you to come?
- Go home.
[...]