Matthew 28:18:
And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth.
Notes on Matthew 28:18:
Do the math. If Jesus has ALL power, how much does Satan have now?
The word power here could also be translated authority. Because He immediately followed this with “Go ye therefore,” we know that this power (or authority) is available to us as we go out and preach in His name. Otherwise, the “therefore” would not make sense. If Jesus were to keep this power to Himself, it would not be a reason to go out and evangelize. Compare this to Mark 16:15-18 and Mark 16:20 and you’ll see that the Lord works this power through us as we go out in His name. Our right to lay hands on the sick and cast out devils in the name of Jesus is proof that Jesus gave His authority to His Church, which is His body on the earth. This should be no big shock, because the Church is one with its Head. Something can’t belong to your head and not belong to the rest of your body, can it? Would it make sense to say, “This car belongs to my head but not to my body?” No, your body is one with your head. It is our oneness with Christ that allows us to go out and use His authority in the earth today.
See also:
Do the Math
How to Deal with the Devil
Objection: Laying Hands on the Sick Is Not Part of the Great Commission