belief of demons in the bible

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I command you in the name of Jesus Christ to come out of her

Submit yourselves therefore to God. Resist the devil, and he will flee from you. Little children, you are from God and have overcome them, for he who is in you is greater than he who is in the world. Beloved, do not believe every spirit, but test the spirits to see whether they are from God, for many false prophets have gone out into the world. By this you know the Spirit of God: every spirit that confesses that Jesus Christ has come in the flesh is from God, and every spirit that does not confess Jesus is not from God. This is the spirit of the antichrist, which you heard was coming and now is in the world already.

And in the synagogue there was a man who had the spirit of an unclean demon, and he cried out with a loud voice, “Ha! What have you to do with us, Jesus of Nazareth? Have you come to destroy us? I know who you are—the Holy One of God.” But Jesus rebuked him, saying, “Be silent and come out of him!” And when the demon had thrown him down in their midst, he came out of him, having done him no harm. And they were all amazed and said to one another, “What is this word? For with authority and power he commands the unclean spirits, and they come out!” When you come into the land that the Lord your God is giving you, you shall not learn to follow the abominable practices of those nations.

 There shall not be found among you anyone who burns his son or his daughter as an offering, anyone who practices divination or tells fortunes or interprets omens, or a sorcerer or a charmer or a medium or a necromancer or one who inquires of the dead, for whoever does these things is an abomination to the Lord. And because of these abominations the Lord your God is driving them out before you.

 You shall be blameless before the Lord your God,Paul, a servant of Christ Jesus, called to be an apostle, set apart for the gospel of God, which he promised beforehand through his prophets in the holy Scriptures, concerning his Son, who was descended from David according to the flesh and was declared to be the Son of God in power according to the Spirit of holiness by his resurrection from the dead, Jesus Christ our Lord, through whom we have received grace and apostleship to bring about the obedience of faith for the sake of his name among all the nations,Then a harmful spirit from the Lord came upon Saul, as he sat in his house with his spear in his hand. And David was playing the lyre. And Saul sought to pin David to the wall with the spear, but he eluded Saul, so that he struck the spear into the wall. 

And David fled and escaped that night.Enter into the rock and hide in the dust from before the terror of the Lord, and from the splendor of his majesty. The haughty looks of man shall be brought low, and the lofty pride of men shall be humbled, and the Lord alone will be exalted in that day. For the Lord of hosts has a day against all that is proud and lofty, against all that is lifted up—and it shall be brought low; against all the cedars of Lebanon, lofty and lifted up; and against all the oaks of Bashan; against all the lofty mountains, and against all the uplifted hills;

And he burned his sons as an offering in the Valley of the Son of Hinnom, and used fortune-telling and omens and sorcery, and dealt with mediums and with necromancers. He did much evil in the sight of the Lord, provoking him to anger.