Therefore, as for you, let that remain in you which you heard from the beginning. If that which you heard from the beginning remains in you, you also will remain in the Son, and in the Father.
But that's just an addition to the text; you notice it's in italics. Which indicates it to be an addition to the text, and they're just trying to complete the thought, but the thought is complete enough without their addition. "Whosoever denies the Son has not the Father."