KJV:
In this the children of God are manifest, and the children of the devil: whosoever doeth not righteousness is not of God, neither he that loveth not his brother.
NASB:
By this the children of God and the children of the devil are obvious: anyone who does not practice righteousness is not of God, nor the one who does not love his brother.
KJV:
For this is the message that ye heard from the beginning, that we should love one another.
NASB:
For this is the message which you have heard from the beginning, that we should love one another;
KJV:
We know that we have passed from death unto life, because we love the brethren. He that loveth not his brother abideth in death.
NASB:
We know that we have passed out of death into life, because we love the brethren. He who does not love abides in death.
KJV:
My little children, let us not love in word, neither in tongue; but in deed and in truth.
NASB:
Little children, let us not love with word or with tongue, but in deed and truth.
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:
Beloved, let us love one another: for love is of God; and every one that loveth is born of God, and knoweth God.
NASB:
Beloved, let us love one another, for love is from God; and everyone who loves is born of God and knows God.