All things whatsoever ye would that men should do to you, do ye even so to them; for this is the law and the prophets.
(Christian, Matthew 7:12)

Hurt not others in ways that you yourself would find hurtful.
(Buddhist, Udana-Varga 5:18)

Regard your neighbor's gain as your own gain and your neighbor's loss as your own loss.
(Taoist, T'ai Shang Kan Ying P'ien)

What is hateful to you, do not to your fellow man. That is the entire Law; all the rest is commentary.
(Jewish, Talmud, Shabbat 31a)

This is the sum of duty: Do naught unto others which would cause you pain if done to you.
(Brahman, Mahabharata 5:1517)

Surely it is the maxim of loving kindness: Do not unto others what you would not have done unto you.
(Confucian, Analects 15:23)

That nature alone is good which refrains from doing unto another whatsoever is not good for itself.
(Zoroastrian, Dadistan-i-dinik 94:5)

No one of you is a believer until he desires for his brother that which he desires for himself.
(Islamic, Sunnah)

And harm ye none, do as ye will
(Wiccan Rede)

Thank you Jan for the fallowing additions!

If your sister cooks for you using a broken pot, do the same for her.
(Kipsigis people of Kenya)

Don't do evil to others, for if you do, you will pay for it here on earth.
(Kikuyu people of Kenya)

Whenever a person breaks a stick in the forest, Let him consider what it would feel like if it were himself. (that was thus broken)
&
As sensitive to pain are rats’ little ones, so sensitive to pain are birds’ little ones.
(the People Yoruba, West Africa)

Jainism:
In happiness and suffering, in joy and grief, we should regard all creatures as we regard our own self, and should therefore refrain from inflicting upon others such injury as would appear undesirable to us if inflicted upon ourselves.
(Yoga-´Sastra)

Sikhism:
As thou deemest thyeslf so deem others.
(Guru Nának)

The Bahá’í Faith:
O Son of Being! Ascribe not to any soul that which thou wouldest not have ascribed to thee, and say not that which thou doest not This is My command unto thee do thou observe it.
(Baha’u’ll-ah)

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