'Demons' in the Bible

Many will say to me in that day, Lord, lord, have we not in thy name prophesied? and in thy name cast out demons? and in thy name done many mighty things?

and the demons were calling on him, saying, 'If thou dost cast us forth, permit us to go away to the herd of the swine;'

but the Pharisees said, 'By the ruler of the demons he doth cast out the demons.'

infirm ones be healing, lepers be cleansing, dead be raising, demons be casting out -- freely ye did receive, freely give.

but the Pharisees having heard, said, 'This one doth not cast out demons, except by Beelzeboul, ruler of the demons.'

And if I, by Beelzeboul, do cast out the demons, your sons -- by whom do they cast out? because of this they -- they shall be your judges.

'But if I, by the Spirit of God, do cast out the demons, then come already unto you did the reign of God.