- Man, you're crazy. This pretty white woman?
- I'm not kidding, brother.
- That's right, brother.
- That woman's gone.

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

You can hear this line at 00:20:31.931 in the Blu-ray version of the movie.

Quote context

[...]

- I got a very important message for you. I want you to invite her over to our mosque.

- Look, brother, ain't nothing no more important than what I'm getting ready to do now. So, leave me alone.

- Yeah, but what you going to do, brother?

- Wait.

- Hey, baby! Wait!

- Oh, man, you made me miss the woman. She's gone.

- Man, I did you a good favor, brother.

- Did me a favor?

- That's worse than dope and alcohol. That white woman, that's man's trick. That's worse than alcohol.

- Man, you're crazy. This pretty white woman?

- I'm not kidding, brother.

- That's right, brother.

- That woman's gone.

- Have you ever heard of Malcolm X?

- Yeah, I heard of Malcolm X. He's right over here at the mosque right now, and I want to invite you over.

- No Malcolm X over here, man.

- Now, would I lie to you?

- Malcolm X out here in the ghetto?

- In the ghetto. He's right over here. Would I lie to you?

- Do you know who I am?

- Yeah, I know who you are.

- What's my name?

- You're Cassius Clay.

- And you know I can fight.

- Oh, don't you worry about that.

- Don't be lying to me.

- I wouldn't lie to you.

[...]