Translations
Whosoever abideth in him sinneth not: whosoever sinneth hath not seen him, neither known him.
No one who remains in Him goes on sinning — and no one who goes on sinning has truly seen or known Him.
No one who abides in Him continues in sin — and no one who continues in sin has ever truly seen or come to know Him.
No one who remains in Him keeps on sinning. No one who continues to sin has seen Him or known Him.

