'New Commandment' in the Bible

A new commandment I give unto you, That ye love one another; ---as I have loved you, that ye also love one another: for by this shall all men know that ye are my disciples,

Brethren, I write not a new commandment unto you, but an old commandment which ye had from the beginning: the old commandment is the word which ye have heard from the beginning:

though I write it again as a new commandment, which is truth in Him and in you: because the darkness is past, and the true light now shineth.

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