Brahmanism — Mahabharata 5:5157
This is the sum of duty: Do naught unto others which would cause you pain if done to you. 

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Buddhism — Udana-Varga 5:18
Hurt not others in ways that you yourself would find hurtful. 

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Christianity — Matthew 7:12
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. (King James) So always treat others as you would like them to treat you. (Jerusalem) 

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Confucianism — Analects 15:23
Surely it is the maxim of loving-kindness: Do not unto others what you would not have them do unto you. 

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Islam — Sunnah
No one of you is a believer until he desires for his brother that which he desires for himself. 

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

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Taoism — T'ai Shang Kan Ying P'ien
Regard your neighbor's gain as your own gain and your neighbor's loss as your own loss. 

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Zoroastrianism — Dadistan-i-dinik 94:5
That nature alone is good which refrains from doing unto another whatsoever is not good for itself.