'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 write no new commandment to you, but an old commandment, which you have had from the beginning; the old commandment is the word, which you have heard from the beginning.

Again, a new commandment I do write to you, which is true as it respects him and you; because the darkness is past, and the true light now shines.

And now I beseech you, lady, not as though I wrote a new commandment to you, but that which we had from the beginning, that we love one another.