- Who broke the promise, Mama?
- Speak up, whoever you are.
- Why, I don't know, dear.

4 seconds sound clip from The New Adventures of Winnie the Pooh - Un-Valentine's Day (S2E5).

You can hear this line at 00:12:08.760 in the Blu-ray version of the TV Series.

Quote context

[...]

- Yes! It was me! I did it! I'm sorry!

- Aha! And why did you send the valentine, Piglet?

- Well, you see, actually, it wasn't me.

- Then why did you confess?

- I'm not very good under pressure?

- We must get to the bottom of this.

- Say, who's the guilty party around here?

- Who broke the promise, Mama?

- Speak up, whoever you are.

- Why, I don't know, dear.

- Order. Order! Order!

- Perhaps it was someone who didn't know about our promise. Someone like... Christopher Robin.

- Pooh, you're right. He didn't know. It must have been him.

- Well, if Christopher Robin's sending cards, we're going to have to send him one, too... in self-defense.

- We should.

[...]