we do unto others as we would have them do unto us

It's not a quote but an interpretation:

From religioustolerance.org:

The Ethic of Reciprocity -- often called the Golden Rule in Christianity -- simply states that we are to treat other people as we would wish to be treated ourselves.

Almost all organized religions have such an ethic. It is normally intended to apply to the entire human race. Unfortunately, it is too often applied by some people only to fellow believers.

A listing of the Ethic of Reciprocity from many religions may be found Here.