Because ma says if I give him to you, he's yours.
5 seconds sound clip from the Song of the South (1946) movie soundboard.
You can hear this line at 00:43:34.239 in the Blu-ray version of the movie.
Quote context
[...]
- You're not going to take him! He's mine!
- We'll get him yet! You'll see!
- Yeah!
- Johnny!
- Don't you pay no attention to them. If they makes trouble, you just tell my ma.
- Because ma says if I give him to you, he's yours.
- Remember, you just tell my ma, she'll whale the daylights out of them!
- Sticking my foot in it, Uncle Remus?
- Ain't you never heard that tale?
- Lordy me, I declare to gracious. I sure ought to told you about that.
- Well, sir, once upon a time... not your time, nor yet my time, but one time, I was going fishing.
[...]