'Evil One' in the Bible

I am writing to you, fathers, because you have come to know him who is from the beginning. I am writing to you, young men, because you have fully overcome the Evil One. I have written to you, little children, because you have learned to know the father.

I have written to you, fathers, because you have learned to know him who is from the beginning. I have written to you, young men, because you are strong, and the word of God is abiding in you, and you have fully overcome the Evil One.

We are not to be like Cain, who belonged to the Evil One, and murdered his brother. And why did he murder him? It was because his own deeds were evil, and his brother's, righteous.

We know that whoever is a child of God is not habitually committing sin; but he who is God's child guards himself, and the Evil One never touches him.

We know that we are of God, and the whole world is lying in the Evil One.