- Kill her? And the boy?
- Why not? Isn't it the ancient law of the wild Macedonian chiefs?

12 seconds sound clip from the Alexander the Great (1956) movie soundboard.

You can hear this line at 00:09:19 in the Blu-ray version of the movie.

Quote context

[...]

(Knife hitting wood)

- And if you kill him, what?

- Pleasure, bloody pleasure.

- And if you're wrong?

- An Egyptian soothsayer dies, that's all.

- And Philip, king of Macedonia, says to the world?

- That he is also a man.

- A madman! And if you are, play the role and also kill her and the boy.

- Kill her? And the boy?

- Why not? Isn't it the ancient law of the wild Macedonian chiefs?

- You knew what she was when you married her: proud and jealous, as wild and strange as the mountains from which she came and the strange gods whom she worshipped.

- What she thinks I don't know, but this I do know: She's a woman and she taunts you.

- Taunts me? Tears me.

- And what do you believe, Parmenio?

[...]