I swear on my mother's...
2 seconds sound clip from the The Big Heat (1953) movie soundboard.
You can hear this line at 01:06:34.820 in the Blu-ray version of the movie.
Quote context
[...]
- Go on. Pick it up. I won't kill you, not right away.
- You got a wrong steer. If I knew what you was talking about...
- What did he do for you? When I let go, start talking. If you don't, I'll finish the job. Talk.
- He told me to get you. Vince Stone. I hired Slim.
- Stone. He was scared Duncan told her things.
[...]