You are beaten. It is useless to resist. Don't let yourself be destroyed as Obi-Wan did.
8 seconds sound clip from the Star Wars: Episode V - The Empire Strikes Back movie soundboard.
You can hear this line at 01:50:08 in the Blu-ray version of the movie.
Quote context
[...]
- Ouch! Oh! That hurts! Bend down, you thoughtless... Ow!
- I thought that hairy beast would be the end of me.
- Of course I've looked better.
(Lightsabers battle sound effect) (3)
- You are beaten. It is useless to resist. Don't let yourself be destroyed as Obi-Wan did.
(Lightsabers battle sound effect) (4)
- There is no escape. Don't make me destroy you.
- Luke, you do not yet realize your importance.
- You have only begun to discover your power.
[...]