And as ye would that men should do to you, do ye also to them likewise.
και καθως θελετε ινα ποιωσιν υμιν οι ανθρωποι και υμεις ποιειτε αυτοις ομοιως
Luke 6:31
The same idea in other traditions
Let none deceive another, nor look down on anyone anywhere. Though provoked or aggrieved, let them not wish pain on each other.
Indifferent to worldly objects, a man should wander about treating all creatures in the world so as he himself would be treated.
Thou shalt not take vengeance, nor bear any grudge against the children of thy people, but thou shalt love thy neighbour as thyself: I am the LORD.
Tsze-kung asked, saying, "Is there one word which may serve as a rule of practice for all one's life?" The Master said, "Is not RECIPROCITY such a word? What you do not want done to yourself, do not do to others."
Do not utter even a single harsh word; your True Lord and Master abides in all. Do not break anyone's heart; these are all priceless jewels. The minds of all are like precious jewels; to harm them is not good at all. If you desire your Beloved, then do not break anyone's heart.