John 8:44 ESV
You are of your father the devil, and your will is to do your father's desires. He was a murderer from the beginning, and does not stand in the truth, because there is no truth in him. When he lies, he speaks out of his own character, for he is a liar and the father of lies.
1 Peter 5:8 ESV
Be sober-minded; be watchful. Your adversary the devil prowls around like a roaring lion, seeking someone to devour.
Revelation 12:9 ESV
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.
Ephesians 6:12 ESV
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.