I have a question about excorcisms
Why is that the devil is able to disobey God, but must do as Jesus commands?
Why can't the devil disobey Jesus as well?
Scripture makes clear that the demons must obey Jesus because He is God almighty, keep in mind that Satan could not send that tornado, could not afflict Job, kill his children, put boils upon Jobs body without first being granted the petition to remove the hedge of protection surrounding Job. He was told he could not kill him but he did gain permission to afflict him with great sufferings. The authority of Jesus Name belongs to the born again believer also and demons must obey the believer who walks in the authority of Christ's name. That is how we cast out demons. Read Mark 16 for the great commission given to the followers of Christ. Also here is the authority of the believer:
It is written:
Behold, I have given you authority to trample upon serpents and scorpions and over all the power of the enemy and nothing shall by any means harm you. - Luke 10: 19
When Jesus cast the demons out of the madman who was roaming about the tombs - the demons cried out asking permission to be cast into some pigs - because demons seek to indwell a physical body - being a person or an animal. Consider these scriptures Amrchaos:
Mark 5:3 This man lived in the tombs, and no one could bind him anymore, not even with a chain.
Context
Demons Cast into Pigs
…2When He got out of the boat, immediately a man from the tombs with an unclean spirit met Him, 3and he had his dwelling among the tombs. And no one was able to bind him anymore, even with a chain; 4because he had often been bound with shackles and chains, and the chains had been torn apart by him and the shackles broken in pieces, and no one was strong enough to subdue him.…
Cross References
Mark 5:2
When Jesus got out of the boat, a man with an impure spirit came from the tombs to meet him.
Mark 5:4
For he had often been chained hand and foot, but he tore the chains apart and broke the irons on his feet. No one was strong enough to subdue him.
Treasury of Scripture
Who had his dwelling among the tombs; and no man could bind him, no, not with chains:
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Amrchaos - please note how the demons indwelling this man address Jesus Christ:
http://biblehub.com/matthew/8-29.htm
And, behold, they cried out, saying, What have we to do with thee, Jesus, thou Son of God? art thou come hither to torment us before the time?
Context
Demons Cast into Pigs
28When He came to the other side into the country of the Gadarenes, two men who were demon-possessed met Him as they were coming out of the tombs. They were so extremely violent that no one could pass by that way. 29And they cried out, saying, "What business do we have with each other, Son of God? Have You come here to torment us before the time?" 30Now there was a herd of many swine feeding at a distance from them.…
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So as you can see, Amrchaos, the demons know who Jesus is. Who is Jesus? The Son of God. Why do they obey him? Because they have to! Today? They still have to! How so? When the Lord sends His servants to minister to those bound by demons - it is to cast those devils out! Set the captives free! Who has done this? Jesus Christ has done it. It is finished. This is the message of the cross. See Mark 16.
Are there people on the earth demon possessed today? Of course there are. There are many, many testimonies of people being delivered of demonic possession - how? A christian prayed for them and cast the demons out. See the thread on USMB - Testimony of an Ex-Satanist. You can also look up the testimonies of former satanists, occultists, witches, etc. who have been delivered of demons - testimonies found on the internet, on youtube, in books written by born again Christians, the testimonies are in the tens of thousands. Jesus is still healing, delivering, and saving the multitudes today. How blessed are the feet of those who bring the good news! Romans 10: 8,9,10. Amen.