'New Commandment' in the Bible

A new commandment give I unto you: that ye love together: as I have loved you, that even so ye love one another.

Brethren, I write no new commandment unto you: but an old commandment which ye had at the beginning. For an old commandment is the word which ye heard from the beginning.

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

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