KJV:
Whosoever shall confess that Jesus is the Son of God, God dwelleth in him, and he in God.
NASB:
Whoever confesses that Jesus is the Son of God, God abides in him, and he in God.
KJV:
And we have known and believed the love that God hath to us. God is love; and he that dwelleth in love dwelleth in God, and God in him.
NASB:
We have come to know and have believed the love which God has for us. God is love, and the one who abides in love abides in God, and God abides in him.
KJV:
For the truth's sake, which dwelleth in us, and shall be with us for ever.
NASB:
for the sake of the truth which abides in us and will be with us forever:
KJV:
Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son.
NASB:
Anyone who goes too far and does not abide in the teaching of Christ, does not have God; the one who abides in the teaching, he has both the Father and the Son.