Could someone please provide one quote that shows prejudice in Chapters 1-6 of To Kill a Mockingbird.

I assume that you are looking for quotes that show that
people in Maycomb during the time the book was set were prejudiced -- not that you are
looking for evidence that Harper Lee herself was prejudiced.  If that is the case, there
are some examples.

Here are a couple of
them:

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The sheriff hadn't
the heart to put him in jail alongside Negroes, so Boo was
locked in the
courthouse basement.

That
shows that people did not think that it was right to put a white suspect in with black
suspects.

Then, in Chapter 6, we find that Mr. Radley has
shot at a "Negro" just for being in his collard patch.  Miss Stephanie says Mr. Radley
missed:

Shot
in the air. Scared him pale,
though. Says if anybody sees a white nigger
around, that's the one.