I got it already. Here.
3 seconds sound clip from the Meet John Doe (1941) movie soundboard.
You can hear this line at 00:18:51 in the DVD version of the movie.
Quote context
[...]
- You trust him, eh? That's fine. I suppose he trusts you too.
- Stop worrying. He's all right.
- Okay, but we don't want more than a hundred people in on this thing.
- The first thing I want is an exact copy of the John Doe letter in your own handwriting.
- That's fine. Now I want you to sign this agreement.
- It gives us an exclusive story under your name, day by day from now until Christmas.
- On December 26th, you get one railroad ticket out of town.
- The Bulletin agrees to pay to have your arm fixed. It's what you want, isn't it?
[...]