'New Commandment' in the Bible

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

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

Again, a new commandment I write to you, which thing is true in him and in you: because the darkness is past, and the true light now shineth.

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