How about the fact that Rabbi Hillel said it first, two ways. (1) "If I am not for myself who is for me? And being for my own self, what am 'I`? And if not now, when?" (2) "That which is hateful to you, do not do to your fellow. That is the whole Torah; the rest is the explanation; go and learn."
Hillel was a venerated Pharisee elder, no wonder the New testament steals his phrasing and demonizes the Pharisees. Hillel the Elder