"What a man dislikes in his superiors, let him not display in the treatment of his inferiors; what he dislikes in inferiors, let him not display in the service of his superiors; what he hates in those who are before him, let him not therewith precede those who are behind him; what he hates in those who are behind him, let him not therewith follow those who are before him; what he hates to receive on the right, let him not bestow on the left; what he hates to receive on the left, let him not bestow on the right : - this is what is called The principle with which, as with a measuring-square, to regulate one's conduct."
The Great Learning 10.2
"Do not do to others what you would not like yourself. Then there will be no resentment against you, either in the family or in the state."
Confucius [K'ung Fu Tse] (551-479 BC), Analects 12:2
"Tsze-kung said, What I do not wish men to do to me, I also wish not to do to men. The Master said, Tsze, you have not attained to that."