Isaiah 22:22

I will place on his shoulder the key to the house of David; what he opens no one can shut, and what he shuts no one can open.

Isaiah 42:6-9

6 “I, the Lord, have called you in righteousness;
    I will take hold of your hand.
I will keep you and will make you
    to be a covenant for the people
    and a light for the Gentiles,
7 to open eyes that are blind,
    to free captives from prison
    and to release from the dungeon those who sit in darkness.
8 “I am the Lord; that is my name!
    I will not yield my glory to another
    or my praise to idols.
9 See, the former things have taken place,
    and new things I declare;
before they spring into being
    I announce them to you.”

Revelation 3:7-8

To the Church in Philadelphia

7 “To the angel of the church in Philadelphia write:

These are the words of him who is holy and true, who holds the key of David. What he opens no one can shut, and what he shuts no one can open. 8 I know your deeds. See, I have placed before you an open door that no one can shut. I know that you have little strength, yet you have kept my word and have not denied my name.