Matthew 16:18-19

16:18 And I tell you that you are Peter, and on this rock I will build my church, and the gates of Hades will not overpower it. 16:19 I will give you the keys of the kingdom of heaven. Whatever you bind on earth will have been bound in heaven, and whatever you release on earth will have been released in heaven.”

Revelation 1:18

1:18 and the one who lives! I was dead, but look, now I am alive – forever and ever – and I hold the keys of death and of Hades!