KJV:
This is he that came by water and blood, even Jesus Christ; not by water only, but by water and blood. And it is the Spirit that beareth witness, because the Spirit is truth.
NASB:
This is the One who came by water and blood, Jesus Christ; not with the water only, but with the water and with the blood. It is the Spirit who testifies, because the Spirit is the truth.
KJV:
If we receive the witness of men, the witness of God is greater: for this is the witness of God which he hath testified of his Son.
NASB:
If we receive the testimony of men, the testimony of God is greater; for the testimony of God is this, that He has testified concerning His Son.
KJV:
And this is the record, that God hath given to us eternal life, and this life is in his Son.
NASB:
And the testimony is this, that God has given us eternal life, and this life is in His Son.
KJV:
These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God.
NASB:
These things I have written to you who believe in the name of the Son of God, so that you may know that you have eternal life.
KJV:
And this is the confidence that we have in him, that, if we ask any thing according to his will, he heareth us:
NASB:
This is the confidence which we have before Him, that, if we ask anything according to His will, He hears us.
KJV:
And we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This is the true God, and eternal life.
NASB:
And we know that the Son of God has come, and has given us understanding so that we may know Him who is true; and we are in Him who is true, in His Son Jesus Christ. This is the true God and eternal life.
KJV:
And this is love, that we walk after his commandments. This is the commandment, That, as ye have heard from the beginning, ye should walk in it.
NASB:
And this is love, that we walk according to His commandments. This is the commandment, just as you have heard from the beginning, that you should walk in it.
KJV:
For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist.
NASB:
For many deceivers have gone out into the world, those who do not acknowledge Jesus Christ as coming in the flesh. This is the deceiver and the antichrist.