If we say that we haven't sinned, we make him a liar, and his word is not in us.
Verse 1 John 1:6 , "He who says he abides in Him," another glorious thing to say, "Oh yes, I abide in Him." A wonderful thing to say, but it's not just saying. If I truly abide in Him, then I will be walking as He walked; we become one.