Acts 19:13-16
13. Some Jews who went around driving out evil spirits tried to invoke the name of the Lord Jesus over those who were demon-possessed. They would say, “In the name of Jesus, whom Paul preaches, I command you to come out.”
14. Seven sons of Sceva, a Jewish chief priest, were doing this.
15. [One day] the evil spirit answered them, “Jesus I know, and I know about Paul, but who are you?”
16. Then the man who had the evil spirit jumped on them and overpowered them all. He gave them such a beating that they ran out of the house naked and bleeding.
**As for your argument that coming in the name of someone means you are them, it’s really quite simple, have you ever represented someone (come in their name) without being the same person? (Working for a company, power of attorney, carried a message...)**
Yes, and I could easly have said, “I come to you with a quality product. The founder, CEO, and operations manager will guarantee satisfaction.” In my case, it is one person, my boss.
The Son testified that it was the Father in him doing the works, and telling him what to say. When the Spirit of God left the man Jesus on the cross, he knew it, crying out. But God raised him from the dead.
The almighty Spirit of God is the Father; the Son testified of that (John 4:23,24). This is key: the Son was only devine while the Father was in him, but now is the dwelling place of ‘all the fulness of the Godhead bodily’ (Col. 2:9).
Lord bless