Matthew 22:34-37, 39-40

But the Pharisees, when they heard that he had put the Sadducees to silence, gathered themselves together. And one of them, a lawyer, asked him a question, trying him: Teacher, which is the great commandment in the law? And he said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind.

And a second like unto it is this, Thou shalt love thy neighbor as thyself. On these two commandments the whole law hangeth, and the prophets.