Ephesians 6:12 (NLT)
For we are not fighting against flesh-and-blood enemies, but against evil rulers and authorities of the unseen world, against mighty powers in this dark world, and against evil spirits in the heavenly places.

1 Peter 5:8 (NLT)
Stay alert! Watch out for your great enemy, the devil. He prowls around like a roaring lion, looking for someone to devour.

Ephesians 6:16 (ESV)
In all circumstances take up the shield of faith, with which you can extinguish all the flaming darts of the evil one;