He is bound to believe me. Our family's word.

5 seconds sound clip from the The Eight Diagram Pole Fighter movie soundboard.

You can hear this line at 00:21:15 in the Blu-ray version of the movie.

Quote context

[...]

- I must go to court to testify.

- Young man, that's not so wise.

- Pan Mei remains in power, who will The Emperor believe? You have no rank anymore.

- Why not? I saw it all with my own eyes. I am a witness.

- You witnessed what? Where is your evidence?

- He is bound to believe me. Our family's word.

- Young man, I wouldn't be so sure.

- Even if you do escape Pan Mei, he'll probably accuse you of desertion, of gross cowardice, and high treason!

- Yeah. I've already been declared a deserter. And traitor.

- If such an announcement has been made why are you going back?

[...]