I knew I had a list somewhere - found it...
~1970-1640 BCE "Do for one who may do for you, / That you may cause him thus to do." - The Tale of the Eloquent Peasant 109-110, Ancient Egypt, tr. R.B. Parkinson.
~700 BCE "That nature only is good when it shall not do unto another whatever is not good for its own self." - Dadistan-i-Dinik 94:5, Zoroastrianism.
? BCE "Whatever is disagreeable to yourself do not do unto others." - Shayast-na-Shayast 13:29, Zoroastrianism.
~550 BCE "Do not seek revenge or bear a grudge against one of your people, but love your neighbor as yourself." - Bible, NIV, Leviticus 19:18, Judaism.
~500 BCE "Hurt not others in ways that you yourself would find hurtful." - Udana-Varga 5:18, Buddhism.
~500 BCE "The Sage...makes the self of the people his self." Tao Te Ching Ch 49, tr. Ch'u Ta-Kao, Unwin Paperbacks, 1976. Daoism
~500 BCE "What you do not want done to yourself, do not do to others." Analects of Confucius 15:24, Confucianism, tr. James Legge.[1]
~500 BCE "Now the man of perfect virtue, wishing to be established himself, seeks also to establish others; wishing to be enlarged himself, he seeks also to enlarge others. To be able to judge of others by what is nigh in ourselves;? this may be called the art of virtue." Analects of Confucius 6:30, Confucianism, tr. James Legge. [2]
~500 BCE "one word that can serve as a principle of conduct for life [is] reciprocity. Do not impose on others what you yourself do not desire." - Doctrine of the Mean 13.3, Confucianism.
~500 BCE "Therefore, neither does he cause violence to others nor does he make others do so." - Acarangasutra 5.101-2, Jainism.
~400 BCE "Do not do to others what would anger you if done to you by others." - Socrates.
~200 BCE "What you hate, do not do to anyone." - Bible, NRSV, Tobit 4:15, Septuagint.
~150 BCE "This is the sum of duty: Do naught unto others which would cause you pain if done to you." - Mahabharata 5:1517, Brahmanism and Hinduism.
~100 CE "What is hateful to you, do not to your fellow man. This is the law: all the rest is commentary." - Hillel; Talmud, Shabbat 31a, Judaism.
~100 CE "Do to others as you would have them do to you." - Bible, NIV, Gospel of Luke 6:31, Christianity
~100 CE "What you would avoid suffering yourself, seek not to impose on others." - Epictetus.
~800 CE "No one of you is a believer until he desires for his brother (fellow Muslim) that which he desires for himself." - Hadith recorded by al-Bukhari, Islam.
? CE "And if thine eyes be turned towards justice, choose thou for thy neighbour that which thou choosest for thyself." - Epistle to the Son of the Wolf, 30, Bahá'í Faith.
~1870 CE "He should not wish for others what he does not wish for himself." - Baha'u'llah, Epistle to the Son of the Wolf Bahá'í Faith.
1999 CE "don't do things you wouldn't want to have done to you." - British Humanist society, Humanism.