What the Bible says about Satan:

1 Peter, chapter 5

8: Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour.
9a: Whom resist stedfast in the faith,

James, chapter 4

7: Submit yourselves therefore to God. Resist the devil, and he will flee from you.

Ephesians, chapter 6

10: Finally, my brethren, be strong in the Lord, and in the power of his might.
11: Put on the whole armor of God, that ye may be able to stand against the wiles of the devil.
12: For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.
13: Wherefore take unto you the whole armor of God, that ye may be able to withstand in the evil day, and having done all, to stand.
14: Stand therefore, having your loins girt about with truth, and having on the breastplate of righteousness;
15: And your feet shod with the preparation of the gospel of peace;
16: Above all, taking the shield of faith, wherewith ye shall be able to quench all the fiery darts of the wicked.
17: And take the helmet of salvation, and the sword of the Spirit, which is the word of God:
18: Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints;

Hebrews, chapter 2

9: But we see Jesus, who was made a little lower than the angels for the suffering of death, crowned with glory and honor; that he by the grace of God should taste death for every man.

14: Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil;
15: And deliver them who through fear of death were all their lifetime subject to bondage.

Colossians, chapter 2

10: And ye are complete in him, which is the head of all principality and power.

15: And having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it.

Colossians, chapter 1

13: Who hath delivered us from the power of darkness, and hath translated us into the kingdom of his dear Son.

Revelation, chapter 12

11: And they overcame him by the blood of the Lamb, and by the word of their testimony; and they loved not their lives unto the death.

1 John, chapter 4

1: Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.
2: Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God:
3: And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world.
4: Ye are of God, little children, and have overcome them: because greater is he that is in you, than he that is in the world.

Luke, chapter 10

17: And the seventy returned again with joy, saying, Lord, even the devils are subject unto us through thy name.
18: And he said unto them, I beheld Satan as lightning fall from heaven.
19: Behold, I give unto you power to tread on serpents and scorpions, and over all the power of the enemy: and nothing shall by any means hurt you.

Mark, chapter 16

17: And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues;
18: They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover.

Matthew, chapter 12

28: But if I cast out devils by the Spirit of God, then the kingdom of God is come unto you.
29: Or else how can one enter into a strong man’s house, and spoil his goods, except he first bind the strong man? and then he will spoil his house.

2 Corinthians, chapter 10

3: For though we walk in the flesh, we do not war after the flesh:
4: (For the weapons of our warfare are not carnal, but mighty through God to the pulling down of strong holds;)
5: Casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ.

Proverbs, chapter 18

10: The name of the LORD is a strong tower: the righteous runneth into it, and is safe.

1 John, chapter 3

8: He that committeth sin is of the devil; for the devil sinneth from the beginning. For this purpose the Son of God was manifested, that he might destroy the works of the devil.

Romans, chapter 16

20: And the God of peace shall bruise Satan under your feet shortly. The grace of our Lord Jesus Christ be with you.  Amen.

1 John, chapter 2

13: I write unto you, fathers, because ye have known him that is from the beginning. I write unto you, young men, because ye have overcome the wicked one. I write unto you, little children, because ye have known the Father.
14: I have written unto you, fathers, because ye have known him that is from the beginning. I have written unto you, young men, because ye are strong, and the word of God abideth in you, and ye have overcome the wicked one.