For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms (Ephesians 6:12).
“The devil” is known by various names in scripture — the tempter, the accuser, Belial, Beelzebub, the prince of this world, etc. All of these refer to the same being who is best known as the serpent or Devil or Satan (Revelation 12:9).