Mind your tongue.

3 seconds sound clip from the Braveheart (1995) movie soundboard.

You can hear this line at 01:09:20 in the Blu-ray version of the movie.

Quote context

[...]

- All right, Father. I'll ask him.

- If I risk my neck for you, will I get a chance to kill Englishmen?

- Is your father a ghost, or do you converse with the Almighty?

- In order to find his equal, an Irishman is forced to talk to God.

- Yes, Father? The Almighty says don't change the subject, just answer the fucking question.

- Mind your tongue.

- Insane Irish.

(SWORDS DRAWING)

- Smart enough to get a dagger past your guards, old man.

- That's my friend, Irishman, and the answer to your question is yes. You fight for me, you get to kill the English.

[...]