You do believe it, or you would not have killed Memnet.
5 seconds sound clip from the The Ten Commandments (1956) movie soundboard.
You can hear this line at 00:56:44.836 in the Blu-ray version of the movie.
Quote context
[...]
- Hold me in your arms. Hold me... close.
- You were not born Prince of Egypt, Moses, but the son of Hebrew slaves.
- I'll believe anything you want me to believe. Say you are not, I'll believe you are not.
- Love cannot drown truth, Nefretiri.
- You do believe it, or you would not have killed Memnet.
- I love you. That's the only truth I know.
- Did this child of the Nile have a mother?
- How could you doubt me? You did not doubt me when I held you as you took your first step.
- It's a wicked lie spun by Ramses.
- Mother, did Ramses spin this?
[...]