Revelation 3:7
"To the messenger of the church in Philadelphia write: 'The Holy and True One, who carries the keys of David, who opens and no one can shut, who shuts and no one can open, speaks as follows:
Matthew 16:18-19
And I, yes I, tell you, your name from now on is to be Peter, Rock, and on a massive rock like this I will build my church, and the powers of the underworld shall never overthrow it.
Matthew 18:18-19
I solemnly say to you, whatever you forbid on earth must be already forbidden in heaven, and whatever you permit on earth must be already permitted in heaven.
Revelation 1:18
yea, the ever-living One. I once was dead, but now I live forever and ever. I carry the keys of death and the underworld.