KJV:
And above all things have fervent charity among yourselves: for charity shall cover the multitude of sins.
NASB:
Above all, keep fervent in your love for one another, because love covers a multitude of sins.
KJV:
If ye be reproached for the name of Christ, happy are ye; for the spirit of glory and of God resteth upon you: on their part he is evil spoken of, but on your part he is glorified.
NASB:
If you are reviled for the name of Christ, you are blessed, because the Spirit of glory and of God rests on you.
KJV:
Casting all your care upon him; for he careth for you.
NASB:
casting all your anxiety on Him, because He cares for you.
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:
But he that hateth his brother is in darkness, and walketh in darkness, and knoweth not whither he goeth, because that darkness hath blinded his eyes.
NASB:
But the one who hates his brother is in the darkness and walks in the darkness, and does not know where he is going because the darkness has blinded his eyes.
KJV:
I write unto you, little children, because your sins are forgiven you for his name's sake.
NASB:
I am writing to you, little children, because your sins have been forgiven you for His name's sake.
KJV:
I write unto you, fathers, because ye have known him that is from the beginning. I write unto you, young men, because ye have overcome the wicked one. I write unto you, little children, because ye have known the Father.
NASB:
I am writing to you, fathers, because you know Him who has been from the beginning. I am writing to you, young men, because you have overcome the evil one. I have written to you, children, because you know the Father.
KJV:
I have written unto you, fathers, because ye have known him that is from the beginning. I have written unto you, young men, because ye are strong, and the word of God abideth in you, and ye have overcome the wicked one.
NASB:
I have written to you, fathers, because you know Him who has been from the beginning. I have written to you, young men, because you are strong, and the word of God abides in you, and you have overcome the evil one.