'New Commandment' in the Bible

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

Brethren, I write no new commandment unto you, but an old commandment which you had from the beginning. The old commandment is the word which you have heard from the beginning.

Again, a new commandment I write unto you, which thing is true in him and in 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 unto you, but that which we had from the beginning, that we love one another.