'New Commandment' in the Bible

A new commandment I give to you, that you love one another; as I have loved you, that you also love one another.

Beloved, I am writing you no new commandment, but an old commandment that you had from the beginning. The old commandment is the word that you have heard.

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

And now I ask you, lady, not as though I were writing you a new commandment, but the one we have had from the beginning, that we love one another.