Tell him that, message boy. Be sure he gets that.

5 seconds sound clip from the The Greatest (1977) movie soundboard.

You can hear this line at 00:30:42.432 in the Blu-ray version of the movie.

Quote context

[...]

- The champ wants you to drink your orange juice and drink your milkshake. You talked yourself into a title bout.

- He just hopes you can keep your mouth shut, or he'll ram his fist so far down your throat, it'll take him a week to pull it out.

- I'll tell you what to do, message boy. You go back and tell him that I appreciate the opportunity of fighting for my title, 'cause it's going to be mine.

- Also, you tell him that after the fight, don't worry, because he will not be unemployed, he can be my chief sparring partner. You go tell him that, dear.

- I'll see you.

- That's right.

- Tell him that, message boy. Be sure he gets that.

- Boy, you can ride a bicycle. How you doing?

- Fine, how are you?

- All right.

- No, you. Ladies first. I forgot.

- Oh, no, after you, Mr. Clay. You must be a lot thirstier than I am.

- No, I can wait.

- Mr. Clay? How do you... Where do you know me from?

- Lots of places. You know, the picture on your album cover, The Greatest.

- Oh, that album cover, The Greatest. You got that?

- How many times have you heard that?

- About 6000 times.

- Mmm!

- No, my kid brother keeps listening to it, you know.

[...]