Many were to die, both for the further glorification of the princess and to ensure that the location of the tomb remained a secret.
7 seconds sound clip from the The Mummy (1959) movie soundboard.
You can hear this line at 00:38:13.240 in the Blu-ray version of the movie.
Quote context
[...]
- As the high priestess of the god Karnak, to have done less would have been committing sacrilege.
- And behind him came the casket containing the heart of the princess.
- Much blood was to flow during the succeeding days.
- They all died so that their spirits would accompany that of their princess into the afterworld.
- Hail to thee, child of the god Shu.
- The underworld has gained mastery over his diadem.
[...]