Either you make this announcement to the public, or the fight's off, and you'll never get another chance at the title.
4 seconds sound clip from the The Greatest (1977) movie soundboard.
You can hear this line at 00:38:45.840 in the Blu-ray version of the movie.
Quote context
[...]
- You have the chance to make millions if you win the title.
- I'm not gonna fire my cooks.
- I'll stay quiet, and I won't do nothing till the fight's over.
- Well, that's no concession at all. You're not giving up a thing.
- Is that why I'm here? You want me to make an announcement?
- I will announce it right now...
- Announce what? ...unless you tell me what you're gonna do.
- I'm telling you I'm not gonna do. I'm not gonna denounce my religion.
- You already said that. Don't run off at the mouth, Cassius. Don't run off at the mouth!
- Oh, man. Well, call the fight off!
[...]