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

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

Christianity:  So whatever you wish that men would do to you, do so to them; for this is the law and the prophets.
Matthew 7:12

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

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

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

Judeo-Christian:  You shall not take vengeance or bear a grudge against your countrymen. Love your fellow as yourself: I am the Lord.
Leviticus 19:18

Taoism:  Regard your neighbor's gain as your own gain, and your neighbor's loss as your own loss.
T'ai Shag Kan Ying P'ien

Zoroastrianism:  That nature only is good when it shall not do unto another whatever is not good for its own self.
Avesta: Dadistan-i-dink 94:5