Binding and loosing only function for those who are Jesus Christ Disciples. In other words, God has awarded this Believer with "Righteousness (Romans 4:5)" because their Faith is placed and maintained exclusively in Christ and the Finish Work at Calvary's Cross where the victory was won. Therefore this Believer receives the help of the Holy Spirit by the "Law of the Spirit of Life in Christ Jesus - Romans 8:2. This Believer is able to take authority over the demonic.
“19 And I will give unto you (“you” refers to all Believers) the keys of the Kingdom of Heaven (refers to symbols of authority, the privilege of preaching or proclaiming the Gospel, which is the privilege of every Believer): and whatsoever you shall bind on earth shall be bound in Heaven (Christ has given the authority and power to every Believer to bind Satan and his minions of darkness, and to do so by using the Name of Jesus [Mk. 16:17-18; Lk. 10:19]): and whatsoever you shall loose on earth shall be loosed in Heaven (looses the Power of God according to the usage of the Name of Jesus; this is the authority of the Believer).” Matthew 16:19
JSM
We have been given the keys of the Kingdom (Matthew 16:19). This gives us the authority to "bind" and "loose." "Binding" ties Satan's hands and stops his power to "steal, kill, and destroy," likewise, the "loosing" releases all that Jesus did at Calvary and the Resurrection. "Binding" has to do with the spirit world of darkness while "loosing" has to do with the Spirit world of Light. To "bind" means to restrict, stop, hinder, fetter, check, hold back, arrest, or put a stop to. To "loose" means to untie, unbind, unlock, liberate, release, forgive, or free.
Warning: Do not try and cast out devils if you aren't a Disciple (saved).
Acts 19:11-20 : The Sons of Sceva thought they were Disciples. (Righteousness is only awarded by God to the Believer by Faith placed and maintained exclusively in Christ and the Finished Work at Calvary Cross where the victory was won, i.e., "The Blood of Jesus." (Romans 4:5, 8:2)
John 6:53 - "Except you eat the Flesh of the Son of Man, and drink His Blood, you have no life in you," (presents the demand that caused "many of His Disciples to go back, and walk no more with Him" (John 6:66). It does the same presently! This Verse tells us the degree of believing that is required; it refers to the Cross being the total Object of one's belief; failing that, there is no Life in you).
John 6:66 - From that time many of His Disciples went back, and walk no more with Him.
JSM