Their betrayal will be dealt with.
5 seconds sound clip from the Star Wars: Episode III - Revenge of the Sith movie soundboard.
You can hear this line at 01:18:39 in the Blu-ray version of the movie.
Quote context
[...]
- First, I want you to go to the Jedi temple.
- We will catch them off-balance.
- Do what must be done, Lord Vader. Do not hesitate. Show no mercy.
- Only then, when you'll be strong enough with the dark side to save Padme.
- What about the other Jedi spread across the galaxy?
- Their betrayal will be dealt with.
- After you have killed all the Jedi in the temple, go the Mustafar system.
- Wipe out Viceroy, Gunray and the other separatist leaders.
- Once more the Sith will rule the galaxy! And we shall have peace.
[...]