Revelation 3:7, 14

And to the angel of the church in Philadelphia write: These things saith he that is holy, he that is true, he that hath the key of David, he that openeth and none shall shut, and that shutteth and none openeth

And to the angel of the church in Laodicea write: These things saith the Amen, the faithful and true witness, the beginning of the creation of God