See also:

JN 13:34 A new commandment I give unto you, That ye love one another; as I have loved you, that ye also love one another.

1JN 3:23 And this is his commandment, That we should believe on the name of his Son Jesus Christ, and love one another, as he gave us commandment.

1JN 4:8 He that loveth not knoweth not God; for God is love.
1JN 4:9 In this was manifested the love of God toward us, because that God sent his only begotten Son into the world, that we might live through him.

GAL 5:13 For, brethren, ye have been called unto liberty; only use not liberty for an occasion to the flesh, but by love serve one another.
GAL 5:14 For all the law is fulfilled in one word, even in this; Thou shalt love thy neighbour as thyself.