From Harper Lee's To Kill a Mockingbird, what quotations demonstrate that Tom Robinson symbolizes a mockingbird?

A symbol
in a piece of literature is a recurring object, color, etc., that is used to support a major
theme in that piece of literature.

To understand the significance of Tom
Robinson representing the symbol of a mockingbird, one needs to recall '
instructions to the children when they received their air rifles as gifts, and Miss Maudie's
explanation:

Remember its a sin to kill a mockingbird.
That was the only time I ever heard Atticus say it was a sin to do something, and I asked Miss
Maudie about it. 

Your fathers right, she said. Mockingbirds dont do one
thing but make music for us to enjoy . . . but sing their hearts out for us. Thats why its a sin
to kill a mockingbird.

The overall concept is that it is
ethically wrong to harm anything or anyone that does nothing to harm othersit's wrong to harm an
innocent.

There are a couple ofin 's that can be seen
as mockingbirds . One in particular is Tom Robinson, a...