It said the killer is after those who've cooked for the emperor and he's vowed to kill them all. No cook will be spared.
9 seconds sound clip from the Of Cooks And Kung Fu (1979) movie soundboard.
You can hear this line at 00:55:16 in the Blu-ray version of the movie.
Quote context
[...]
- Better think about it and wise up, you're stupid. Get smart, will you use your brains?
- It's okay to kick me out, but remember the emperor is my master's friend.
- Oh. Haven't you heard the news of the cooking murders?
- Oh, thank you. I'm grateful.
- Now tell me, what were you saying to that man over there? The one dressed in blue?
[...]