Matthew 22:39

Owe nothing to anyone except to love one another; for he who loves his neighbor has fulfilled the law.

Love does not work evil against a neighbor; therefore love is the fulfillment of the Law.

And for this reason He is the mediator of a new covenant, so that, since a death has taken place for the redemption of the trespasses that were committed under the first covenant, those who have been called may receive the promise of the eternal inheritance.

And this commandment we have from Him, that the one who loves God should love his brother also.