'Wicked' in the Bible

I write to you, fathers, because ye have known him that is from the beginning. I write to you, young men, because ye have overcome the wicked one. I write to you, little children, because ye have known the Father.

I have written to you, fathers, because ye have known him that is from the beginning. I have written to you, young men, because ye are strong, and the word of God abides in you, and ye have overcome the wicked one.

not as Cain was of the wicked one, and slew his brother; and on account of what slew he him? because his works were wicked, and those of his brother righteous.

We know that every one begotten of God does not sin, but he that has been begotten of God keeps himself, and the wicked one does not touch him.

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