Four of Christ's thirty-three miracles involve the casting out of demons. Satan always seeks to oppose God's work, leading to a notable increase in demonic activity during the years of Jesus' ministry. Scripture reveals that exposing and expelling satan and his demons is the responsibility of Christ. Some demons desire embodiment, resulting in possession where one or more demons inhabit a human or even animals. Mental and physical diseases often accompany demon-possession, as demons seek to destroy the bodies they inhabit. In the synagogue, Jesus performs an exorcism, demonstrating His authority over demons. On a busy day, He teaches, casts out a demon, and later heals many, including those demon-possessed, showing His power and compassion. The demons are called unclean spirits due to their moral impurity and contrary attitude, violently recoiling in fear when faced with the holiness of Christ. Demons invade people by overriding their conscious personality, allowing the unclean spirit to speak through them. They resentfully lust for victory over humanity, and though God limits possession, He often allows demons to heavily influence individuals, reflecting the unclean spiritual condition of society. The demon in the synagogue recognizes Jesus as the Holy One of God, but He prohibits its testimony, refusing to accept witness from a lying, diabolical source. Jesus does not converse with demons but commands them with the authority of His heavenly Father. He expels the unclean spirit with a direct order, telling it to hold its peace, akin to muzzling, and the demon obeys in rage and anguish. No man can cast out demons by his own power; even the archangel Michael relied on God's authority to rebuke satan. Similarly, Paul commanded a spirit of divination to leave in the name of Jesus Christ. The people in the synagogue are amazed and terrified by Christ's authority, expressing astonishment at this new doctrine and rushing to tell others. Unlike contemporary Jewish methods that used prayers or chants, Christ does not cajole or request demons to leave but authoritatively commands them to come out, showcasing the power of God's Word over evil.

Demons must obey Jesus Christ's command even when people do not, yet they do not leave at once; they object, unwilling to abandon their victims. Christ could have forced them out immediately, but the men may not have survived the exorcism on their own strength. In Mark 9:26-27 a single demon's exit leaves a man convulsed and as one dead until Jesus lifts him up. Both exorcisms stay under Christ's control, and He uses His great power with wise, gentle, and cautious concern. Though Jesus addresses one spirit, the name Legion shows a company of demons, each with its own personality but united under one will and purpose. The swine numbered about two thousand, so the men's plight must have been horrific. Christ does not send the demons into the swine; He only sends them out of the men, and the demons themselves drive the pigs into the sea by divine consent. This may also judge the owners for raising unclean animals in violation of God's law. Demonic powers enter only serpents, symbols of deception, and swine, symbols of uncleanness, so swine are a fitting place to contain unclean spirits. Deliverance brings rest, a desire to follow Christ, modesty and clothing, sanity, and self-control. To avoid repossession, the swept-out mind must be filled with God's Spirit and truth. The delivered man is sent to witness first to family and friends.

In the accounts of Matthew 8:28-34, Mark 5:1-20, and Luke 8:26-39, Christ performed a powerful exorcism on two demon-possessed men, delivering them from the terrible uncleanness caused by demons with a simple word of command. This miracle demonstrates the immense authority and power in the Word of God, which can transform lives dramatically, as seen when Jesus rebuked the unclean spirits, commanding them to come out, and they obeyed without causing harm. While the world attempted to restrain these men with chains and external means, failing to address the root of their affliction, Christ corrected the problem from within, using the unchained power of God's Word to cleanse the inside and provide a true solution to their condition. The uncleanness of both the men and the demons signifies a state of defilement and spiritual impurity, highlighting the separation from God caused by sin, yet through Christ's intervention, freedom from such uncleanness becomes possible.

In the accounts of the miracle, a distressed father approaches Jesus with humility and tears, seeking a miracle for his only son, who is violently insane and demon-possessed. Despite the disciples' inability to exorcise the demon, the father pleads desperately for Christ's help, determined to secure permanent relief for his son from the effects of sin. The demon's presence is marked by the boy's severe affliction, described through sudden, prolonged convulsions that intensify in Jesus' presence, causing the boy to fall, roll, and foam at the mouth. The demon's influence is intense, making the boy deaf and dumb, unable to speak coherently, and emitting loud, shrieking cries. Identified as an unclean spirit, the demon represents defilement, abusing the boy by inducing severe suffering through convulsions, falls, and gnashing of teeth. The affliction's deadliness is evident, suggesting a fatal outcome if not addressed, mirroring the ultimate cost of sin.

Jesus performed exorcisms as a significant part of His work and that of His disciples. The Gospels highlight demon possession as a major problem in Judea and Galilee during His ministry. After one such exorcism the Pharisees criticized Him rather than giving God glory for the man's deliverance from the power of Satan. Because of Israel's unfaithfulness God had removed His protection and demons were nesting everywhere in the kingdom. The Old Testament records that the Israelites had sacrificed to demons in Egypt and that the practice resumed as Israel rejected God. The law contains prohibitions against having anything to do with familiar spirits. In the Parable of the Mustard Seed Jesus uses birds as a symbol for Satan and his demons. The humble mustard plant with its faithful beginning and dramatic growth in time became a place where the demons felt at home. In Luke's account of related parables Jesus healed a woman with a spirit of infirmity whom He described as bound by Satan. The ruler of the synagogue expressed indignation at the healing on the Sabbath. This response showed how far the hearts of the people had turned from their Creator and how aligned they were with their spiritual captor.