7 And there was war in heaven. Michael and his angels fought against the dragon, and the dragon and his angels fought back. 8 But he was not strong enough, and they lost their place in heaven. 9 The great dragon was hurled down — that ancient serpent called the devil, or Satan, who leads the whole world astray. He was hurled to the earth, and his angels with him.
—Rev 12:7-9 (NIV)
36 They worshiped their idols, which became a snare to them. 37 They sacrificed their sons and their daughters to demons.
—Ps 106:36-37 (NIV)
17 They sacrificed to demons, which are not God —
gods they had not known,
gods that recently appeared,
gods your fathers did not fear. —Deut 32:17 (NIV)
28 When he arrived at the other side in the region of the Gadarenes, two demon-possessed men coming from the tombs met him. They were so violent that no one could pass that way. 29 “What do you want with us, Son of God?” they shouted. “Have you come here to torture us before the appointed time?”
30 Some distance from them a large herd of pigs was feeding. 31 The demons begged Jesus, “If you drive us out, send us into the herd of pigs.”
32 He said to them, “Go!” So they came out and went into the pigs, and the whole herd rushed down the steep bank into the lake and died in the water.
—Matt 8:28-32 (NIV)
The Spirit clearly says that in later times some will abandon the faith and follow deceiving spirits and things taught by demons.
—1 Tim 4:1 (NIV)
Then Jesus was led by the Spirit into the desert to be tempted by the devil. 2 After fasting forty days and forty nights, he was hungry. 3 The tempter came to him and said, “If you are the Son of God, tell these stones to become bread.”
—Matt 4:1-3 (NIV)
38 For I am convinced that neither death nor life, neither angels nor demons, neither the present nor the future, nor any powers, 39 neither height nor depth, nor anything else in all creation, will be able to separate us from the love of God that is in Christ Jesus our Lord.
—Rom 8:38-39 (NIV)
7 Have nothing to do with godless myths and old wives’ tales; rather, train yourself to be godly. 8 For physical training is of some value, but godliness has value for all things, holding promise for. 9 This is a trustworthy saying that deserves full acceptance 10 (and for this we labor and strive), that we have put our hope in the living God, who is the Savior of all men, and especially of those
—1 Tim 4:7-10 (NIV) who believe.
15 Be diligent in these matters; give yourself wholly to them, so that everyone may see your progress. 16 Watch your life and doctrine closely. Persevere in them, because if you do, you will save both yourself and your hearers.
—1 Tim 4:15-16 (NIV)