You keep your mouth shut.
2 seconds sound clip from the The Strange Love of Martha Ivers movie soundboard.
You can hear this line at 00:14:35.196 in the Blu-ray version of the movie.
Quote context
[...]
- Isn't that true, Walter? Isn't it?
- Put it down. Put it exactly where you found it.
- Both of you better go upstairs. I'll phone the police.
- You'll never get away with it. Never.
- But Sam. What about Sam? He was in the house. He saw it.
- Yes, he will. He's scared. That's why he ran away after it happened.
- Sam's scared. He ran away. I didn't. I stayed.
- No, he won't. Not Sam. Not Sam!
- I want to talk to you both. Sit down.
- Now, when the police come, you will tell them exactly what you told me. Do you understand, Martha?
[...]