How I came by it is beside the point.
5 seconds sound clip from the Beat the Devil (1953) movie soundboard.
You can hear this line at 00:41:54 in the Blu-ray version of the movie.
Quote context
[...]
- You mean Mrs. Chelm is an unqualified liar?
- Well, let's say she uses her imagination rather than her memory.
- You will make restitution, will you no, Mr. Dann?
- Why, you fat bandit! I gave you the car in the first place.
- How I came by it is beside the point.
- The fact you gave it to me doesn't make it any the less mine.
- Shut up!
- That's right. Threaten me. It is not enough that you destroy my beautiful car, now you will...
- Stop!
- More than anything, I want Billy to make a grand success out there.
[...]