'Evil One' in the Bible

fathers, I am writing to you, because you know him who is from the very beginning: young men, I am writing to you, because you have conquered the evil One. Children, I have written to you, because you know the Father:

fathers, I have written to you, because you know him who is from the very beginning: young men, I have written to you, because you are strong, and the word of God remains within you, and you have conquered the evil One.

we are not to be like Cain, who belonged to the evil One and slew his brother. And why did he slay him? Because his own deeds were evil and his brother's just.

We know that anyone who is born of God does not sin; He who was born of God preserves him, and the evil One never catches him.

We know that we belong to God, and that the whole world lies in the power of the evil One.