This I swear.

3 seconds sound clip from the The Mummy (1959) movie soundboard.

You can hear this line at 00:14:28.400 in the Blu-ray version of the movie.

Quote context

[...]

(LOUD EXPLOSION)

- Great god Karnak, father of all living things, hear these words from me, the humblest of your servants.

- For this desecration, you will be avenged.

- Those unbelievers who disturb the rest of your handmaiden, the princess Ananka, shall suffer for their blasphemy.

- Though it takes me years of earthly time, I shall re-enter the tomb and find the instrument of your revenge, as ordained by your servants 4000 years ago.

- This I swear.

- Yes, completely unexpected. It happened this morning, when they went to wake him. He asked for you straight away.

- But for three years, he hasn't even acknowledged that he has a son. Now he starts asking for me. How do you explain it, Doctor?

- Frankly, at the moment, I can't.

- I had the thought that his condition was permanent. As you know, I believe that he suffered a physical stroke to the brain. Should be incurable.

- Could this mean that he's going to get better?

- I don't know, Mrs Banning. His condition could be purely temporary.

[...]