I have written to you, fathers, because you know him who is from the beginning. I have written to you, young men, because you are strong, and the word of God remains in you, and you have overcome the evil one.
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."