Until JESUS won the victory over sin and death on the cross and through His resurrection, He cast out demons through His FATHER.
AFTER JESUS WON THE VICTORY...
JESUS IS GIVEN ALL AUTHORITY
JESUS came and told his disciples, “I have been given all authority in heaven and on earth.” (Matthew 28:18)
DEMONS ARE CAST OUT IN JESUS’ NAME
15 And then He told them, “Go into all the world and preach the Good News to everyone. 16 Anyone who believes and is baptized will be saved. But anyone who refuses to believe will be condemned. 17These miraculous signs will accompany those who believe: They will cast out demons in my name, and they will speak in new languages. 18 They will be able to handle snakes with safety, and if they drink anything poisonous, it won’t hurt them. They will be able to place their hands on the sick, and they will be healed.”
19 When the Lord Jesus had finished talking with them, he was taken up into heaven and sat down in the place of honor at God’s right hand. 20And the disciples went everywhere and preached, and the Lord worked through them, confirming what they said by many miraculous signs. (Mark 16:15-20)
“On that day many will say to me, ‘Lord, Lord, did we not prophesy in your name, and cast out demons in your name, and do many mighty works in your name?’ And then I will declare to them, ‘I never knew you; depart from me, you evildoers’” (Matthew 7:21-23).