Isaiah 22:22,revelation 3:7

Matthew 16:18-19 NIV
And I tell you that you are Peter, and on this rock I will build my church, and the gates of Hades will not overcome it. I will give you the keys of the kingdom of heaven; whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven.”

Revelation 1:18 NIV
I am the Living One; I was dead, and now look, I am alive for ever and ever! And I hold the keys of death and Hades.