KJV:
Brethren, I write no 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.
NASB:
Beloved, I am not writing a 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.
KJV:
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 shineth.
NASB:
On the other hand, I am writing a new commandment to you, which is true in Him and in you, because the darkness is passing away and the true Light is already shining.
KJV:
And whatsoever we ask, we receive of him, because we keep his commandments, and do those things that are pleasing in his sight.
NASB:
and whatever we ask we receive from Him, because we keep His commandments and do the things that are pleasing in His sight.
KJV:
And this is his commandment, That we should believe on the name of his Son Jesus Christ, and love one another, as he gave us commandment.
NASB:
This is His commandment, that we believe in the name of His Son Jesus Christ, and love one another, just as He commanded us.
KJV:
And he that keepeth his commandments dwelleth in him, and he in him. And hereby we know that he abideth in us, by the Spirit which he hath given us.
NASB:
The one who keeps His commandments abides in Him, and He in him. We know by this that He abides in us, by the Spirit whom He has given us.
KJV:
And this commandment have we from him, That he who loveth God love his brother also.
NASB:
And this commandment we have from Him, that the one who loves God should love his brother also.