Whoever is bitten by a werewolf and lives becomes a werewolf himself.
8 seconds sound clip from the The Wolf Man (1941) movie soundboard.
You can hear this line at 00:36:46.196 in the Blu-ray version of the movie.
Quote context
[...]
- I tell you, I killed a wolf! A plain, ordinary wolf!
- Take this charm. The pentagram, the sign of the wolf. It can break the evil spell.
- Evil spell, pentagram, wolfsbane. I'm sick of the whole thing! I'm gonna get out of here.
- Whoever is bitten by a werewolf and lives becomes a werewolf himself.
- Quit handing me that. You're just wasting your time.
- The wolf bit you, didn't he?
- Wear this charm over your heart always.
- All right, all right, I'll take it. What's it worth to you?
[...]