You have studied our ancient arts, and you know that you cannot harm me.

4 seconds sound clip from the The Mummy (1932) movie soundboard.

You can hear this line at 00:39:19.320 in the Blu-ray version of the movie.

Quote context

[...]

- Why do you show all this to me?

- Do you think it conceivable that the mummy was not stolen, but restored to a semblance of life by the spell from the Scroll of...

- That scroll is my property. I bought it from a dealer. It is here in this house. I presume in that room.

- We had foreseen this.

- The scroll is in safe hands, and will be destroyed the minute it is known that harm has come to us.

- You have studied our ancient arts, and you know that you cannot harm me.

- You also know that you must return that scroll to me or die.

- Now tell that weak fool to get that scroll, wherever it is, and hand it to his Nubian servant.

- The Nubian!

- The ancient blood.

- So you have made him your slave.

[...]