Lest Satan should get an advantage of us: for we are not ignorant of his devices.
2 Corinthians 11:14
And no marvel; for Satan himself is transformed into an angel of light.
2 Corinthians 12:7
And lest I should be exalted above measure through the abundance of the revelations, there was given to me a thorn in the flesh, the messenger of Satan to buffet me, lest I should be exalted above measure.