'New Commandment' in the Bible

"I give you a new commandment -- to love one another. Just as I have loved you, you also are to love one another.

Dear friends, I am not writing a new commandment to you, but an old commandment which you have had from the beginning. The old commandment is the word that you have already heard.

On the other hand, I am writing a new commandment to you which is true in him and in you, because the darkness is passing away and the true light is already shining.

But now I ask you, lady (not as if I were writing a new commandment to you, but the one we have had from the beginning), that we love one another.