Scribes/Pharisees/people accuse Jesus of using the power of Beelzebub

Mark 3:22 And the scribes which came down from Jerusalem said, He hath Beelzebub, and by the prince of the devils casteth he out devils. Matt 12:24 But when the Pharisees heard it, they said, This fellow doth not cast out devils, but by Beelzebub the prince of the devils. Luke 11:15 But some of them said, He casteth out devils through Beelzebub the chief of the devils. 16 And others, tempting him, sought of him a sign from heaven.
Mark 3:23 And he called them unto him, and said unto them in parables, How can Satan cast out Satan? 24 And if a kingdom be divided against itself, that kingdom cannot stand. 25 And if a house be divided against itself, that house cannot stand. 26 And if Satan rise up against himself, and be divided, he cannot stand, but hath an end. Matt 12:25 And Jesus knew their thoughts, and said unto them, Every kingdom divided against itself is brought to desolation; and every city or house divided against itself shall not stand: 26 And if Satan cast out Satan, he is divided against himself; how shall then his kingdom stand? Luke 11:17 But he, knowing their thoughts, said unto them, Every kingdom divided against itself is brought to desolation; and a house divided against a house falleth. 18 If Satan also be divided against himself, how shall his kingdom stand? because ye say that I cast out devils through Beelzebub.
  Matt 12:27 And if I by Beelzebub cast out devils, by whom do your children cast them out? therefore they shall be your judges. 28 But if I cast out devils by the Spirit of God, then the kingdom of God is come unto you. Luke 11:19 And if I by Beelzebub cast out devils, by whom do your sons cast them out? therefore shall they be your judges. 20 But if I with the finger of God cast out devils, no doubt the kingdom of God is come upon you.
Mark 3:27 No man can enter into a strong man's house, and spoil his goods, except he will first bind the strong man; and then he will spoil his house. Matt 12:29 Or else how can one enter into a strong man's house, and spoil his goods, except he first bind the strong man? and then he will spoil his house. Luke 11:21 When a strong man armed keepeth his palace, his goods are in peace: 22 But when a stronger than he shall come upon him, and overcome him, he taketh from him all his armour wherein he trusted, and divideth his spoils.
  Matt 12:30 He that is not with me is against me; and he that gathereth not with me scattereth abroad. Luke 11:23 He that is not with me is against me: and he that gathereth not with me scattereth.

The possibility that Jesus gets his power from Beelzebub is also brought up in Matthew 9:34.