Submit yourselves therefore to God. Resist the devil and he will flee from you.
1 John 4: 4
Little children, you are of God, and have overcome them; for he who is in you is greater than he who is in the world.
Eph 6: 10 - 12
Finally, be strong in the Lord and in the strength of his might. 11 Put on the whole armor of God, that you may be able to stand against the wiles of the devil. 12 For we are not contending against flesh and blood, but against the principalities, against the powers, against the world rulers of this present darkness, against the spiritual hosts of wickedness in the heavenly places.
1 Tim 6: 12
Fight the good fight of the faith; take hold of the eternal life to which you were called when you made the good confession in the presence of many witnesses.
Eph 4: 27
And give no opportunity to the devil.
Mat 17: 19 - 21
Then the disciples came to Jesus privately and said, 'Why could we not cast it out?' 20 He said to them, "Because of your little faith. For truly, I say to you, if you have faith as a grain of mustard seed, you will say to this mountain, 'Move from here to there,' and it will move; and nothing will be impossible to you."
2 Cor 10: 4, 5
For the weapons of our warfare are not worldly but have divine power to destroy strongholds. 5 We destroy arguments and every proud obstacle to the knowledge of God, and take every thought captive to obey Christ.
1 Pet 5: 8, 9
Be sober, be watchful. Your adversary the devil prowls around like a roaring lion, seeking some one to devour. 9 Resist him, firm in your faith, knowing that the same experience of suffering is required of your brotherhood throughout the world.
2 Tim 4: 18
The Lord will rescue me from every evil and save me for his heavenly kingdom. To him be the glory for ever and ever. Amen.
1 John 3: 8 b
The reason the Son of God appeared was to destroy the works of the devil.
Col 1: 13
He has delivered us from the dominion of darkness and transferred us to the kingdom of his beloved Son.
Mark 9:29
And he said to them, "This kind cannot be driven out by anything but prayer." (Some manuscripts add and fasting)