John 13:34,35 34 “A new commandl I give you: Love one another. As I have loved you, so you must love one another.n 35 By this everyone will know that you are my disciples, if you love one another.”
That was Jesus talking to his disciples and seems to sum up what the hell he was trying to get across. If “Christians” today could manage just that one command, the world would have a completely different vibe.
And since he claimed to speak for his father, God, I would say that this is the law you’re looking for. Or Universal law if you want to be new-agey about it.