Wait! You must not play with toys.
4 seconds sound clip from the Santa Claus Is Comin' to Town (1970) movie soundboard.
You can hear this line at 00:18:40.836 in the Blu-ray version of the movie.
Quote context
[...]
- Now, I got some real nice goodies for you. But not if you look like this.
- You'd better watch out, better not cry, better not pout.
- Why?
- Yeah.
- Toys!
- Why, sure. Compliments of the Kringles!
- But what about the Burgermeister?
- What about him? If he wants a toy, he may have one. I'll save him a big red yo-yo.
- Wait! You must not play with toys.
- That's Miss Jessica, our new schoolteacher.
- Kris Kringle at your service, Miss Jessica.
- How dare you come here in those ridiculous clothes and make fun of me?
[...]