In everything do to others as you would have them do to you; 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 4:15-17).
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).