The priestesses of the Temple of Karnak were the daughters of the reigning pharaohs. They were the sacred virgins of Isis.

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

You can hear this line at 00:04:12.840 in the Blu-ray version of the movie.

Quote context

[...]

- Imhotep, High Priest of the Temple of the Sun at Karnak.

- Poor old fellow. Now, what could you have done to make them treat you like that?

- An execution for treason, I suppose.

- Sacrilege, more likely.

- Look. The sacred spells which protect the soul in its journey to the underworld have been chipped off of the coffin.

- So Imhotep was sentenced to death not only in this world, but in the next.

- Maybe he got too gay with the vestal virgins in the temple.

- Possibly.

- The priestesses of the Temple of Karnak were the daughters of the reigning pharaohs. They were the sacred virgins of Isis.

- Maybe the answer's in that box we found buried with him.

- I see I shall get no more work out of you until after it's open. Come on. Let's have the box up there.

- The Wood's so rotten, it'll fall apart at a touch.

- Whatever it is, it's terribly heavy.

[...]