'Evil' in the Bible

I am writing to you, fathers, because you know Him who has been from the beginning. I am writing to you, young men, because you have overcome the evil one. I have written to you, children, because you know the Father.

I have written to you, fathers, because you know Him who has been from the beginning. I have written to you, young men, because you are strong, and the word of God abides in you, and you have overcome the evil one.

not as Cain, who was of the evil one and slew his brother. And for what reason did he slay him? Because his deeds were evil, and his brother’s were righteous.

We know that no one who is born of God sins; but He who was born of God keeps him, and the evil one does not touch him.

We know that we are of God, and that the whole world lies in the power of the evil one.