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All things whatsoever ye would that men should do to you, do ye so to them; for this is the law and the prophets.
Matthew 7:1 (Christianity)

This is the sum of duty; do naught onto others what you would not have them do unto you. Mahabharata 5,1517 (Hinduism)

Hurt not others in ways that you yourself would find hurtful.
Udana-Varga 5,1 (Buddhism)

No one of you is a believer until he desires for his brother that which he desires for himself.
The Qur'an (Islam)

Regard your neighbor’s gain as your gain, and your neighbor’s loss as your own loss.
Tai Shang Kan Yin P’ien (Taoism)

What is hateful to you, do not do to your fellowman. This is the entire Law; all the rest is commentary.
Talmud, Shabbat 3id (Judaism)

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.
Analects 12:2 (Confucianism)