The GOLDEN RULE in Isocrates, 5th Century BC,Way before both Christianity and Rabbi Hillel.”Do not do to others that which angers you when they do it to you.
“ἃ πάσχοντες ὑφ’ ἑτέρων ὀργίζεσθε, ταῦτα τοὺς ἄλλους μὴ ποιεῖτε.
http://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.01.0144%3Aspeech%3D3%3Asection%3D61

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