Our battle is against demonic forces of evil

 “Put on the whole armor of God, that you may be able to stand against the schemes of the devil. For we do not wrestle against flesh and blood, but against the rulers, against the authorities, against the cosmic powers over this present darkness, against the spiritual forces of evil in the heavenly places.” (Eph. 6:11-12 ESV)

Where demons came from

“Now war arose in heaven, Michael and his angels fighting against the dragon. And the dragon and his angels fought back, but he was defeated, and there was no longer any place for them in heaven. And the great dragon was thrown down, that ancient serpent, who is called the devil and Satan, the deceiver of the whole world—he was thrown down to the earth, and his angels were thrown down with him.” (Rev. 12:7-9 ESV)

Test the spirits to see whether they are from God

“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.” (1 John 4:1 ESV)

Some will depart from the faith by deceitful spirits and demon teachings

“Now the Spirit expressly says that in later times some will depart from the faith by devoting themselves to deceitful spirits and teachings of demons.” (1 Tim. 4:1 ESV)

Demons oppress many

“That evening they brought to him many who were oppressed by demons, and he cast out the spirits with a word and healed all who were sick.” (Matt. 8:16 ESV)

Fortune telling and divination is from demons

“As we were going to the place of prayer, we were met by a slave girl who had a spirit of divination and brought her owners much gain by fortune-telling. She followed Paul and us, crying out, “These men are servants of the Most High God, who proclaim to you the way of salvation.” And this she kept doing for many days. Paul, having become greatly annoyed, turned and said to the spirit, “I command you in the name of Jesus Christ to come out of her.” And it came out that very hour.” (Acts. 16:16-18 ESV)

Demons are subject to the Name of Jesus

“The seventy-two returned with joy, saying, “Lord, even the demons are subject to us in your name!” (Luke 10:17 ESV)

Believers will cast out demons

“And these signs will accompany those who believe: in my name they will cast out demons; they will speak in new tongues.” (Mark. 16:17 ESV)

Jesus appeared to destroy the works of the devil

“Whoever makes a practice of sinning is of the devil, for the devil has been sinning from the beginning. The reason the Son of God appeared was to destroy the works of the devil.” (1 John 3:8 ESV)

Jesus within you is greater than the devil in the world

“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.” (1 John 4:4 ESV)