(in chronological order, from many different traditions)

"This is the sum of duty. Do not unto others that which would cause you pain if done to you."
-- Mahabharata 5:1517, from the Vedic tradition of India,
circa 3000 BC

"What is hateful to you, do not to our fellow man. That is entire Law, all the rest is commentary."
-- Talmud, Shabbat 31a, from the Judaic tradition,
circa 1300 BC

"That nature alone is good which refrains from doing unto another whatsoever is not good for itself."
-- Avesta, Dadistan-i-dinik 94:5, from the Zoroastrian tradition,
circa 600 BC

"Hurt not others in ways that you find hurtful."
-- Tripitaka, Udanga-varga 5,18 , from the Buddhist tradition,
circa 525 BC

"Surely it is the maxim of loving kindness, do not unto others that which you would not have done unto you."
-- Analects, Lun-yu XV,23, from the Confucian tradition,
circa 500 BC

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"One should treat all beings as he himself would be treated."
-- Agamas, Sutrakrtanga 1.10, 1-3, from the Jain tradition,
circa 500 BC

"Regard your neighbor's gain as your gain and your neighbor's loss as your loss."
-- Tai-shang Kang-ying P'ien, from the Taoist tradition,
circa 500 BC

"Do not do to others that which would anger you if others did it to you."
-- Socrates (the Greek philosopher),
circa 470-399 BC

"Treat your inferiors as you would be treated by your superiors."
-- Epistle XLVII,11, from the Seneca tradition,
circa 5-65 AD

"Therefore all things whatsoever you desire that men should do to you, do you even so to them. For this is the Law and the prophets."
-- New Testament, Matthew 7:12, from the Christian tradition,
circa 30 AD

"Be charitable to all beings, love is the representative of God."
-- Ko-ji-ki, Hachiman Kasuga of the Shinto tradition,
circa 500 AD

"No one of you is a believer until he desires for his brother that which he desires for himself."
-- Koran, Sunnah, from the Islam tradition,
circa 620 AD

"We obtain salvation by loving our fellow man and God."
-- Granth, Japji XXI, from the Sikh tradition,
circa 1500 AD