Revelation 3:7 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 no man shutteth; and shutteth, and no man openeth;
8 I know thy works: behold, I have set before thee an open door, and no man can shut it: for thou hast a little strength, and hast kept my word, and hast not denied my name.
The open door is set before the church in Philadephia by Him that is holy and true, Who has the key of David, Who opens and no man shuts, and shuts and no man opens.
The open unshuttable door is set before this church because she has a litle strength, and has kept Jesus’s Word, and has not denied His Name.
Bibloscope 