Palpatine: There is a disturbance in the force. Your assassin, she has become very powerful.

Count Dooku: Yes, my lord. She is quite important to me.

Palpatine: Too important.

Count Dooku: Master…

Palpatine: Silence. I can sense her powers growing stronger. I would hate to think you are training your own sith… apprentice to destroy me.

Count Dooku: Never. My allegiance is to you and you alone.

Palpatine: Then you must prove it. Eliminate her.

Count Dooku: She’s my most trusted…

Palpatine: I said eliminate her!

Count Dooku: As you wish, my lord.

From Star Wars: The Clone Wars – Season 3 Episode 12: ‘Nightsisters’ (3×12)