Our Lord Christ Jesus has given us the Keys to the Kingdom

Matthew 16:19

And I will give unto thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven: and whatsoever thou shalt loose on earth shall be loosed in heaven.

Matthew 10:1

And when he had called unto him his twelve disciples, he gave them power against unclean spirits, to cast them out, and to heal all manner of sickness and all manner of disease.

Matthew 18:20

For where two or three are gathered together in my name, there am I in the midst of them.