3 Bible Verses about Open Doors

And to the angel of the church in Philadelphia write; The holy, true one, the one having the key of David, the one opening, and no one shall shut; and the one shutting, and no one shall open; says these things. I know your works; behold, I have given before you an open door, which no one is able to shut: and you have a little power, and you have kept my word, and not denied my name.

for a door is opened unto me great and effectual, and there are many antagonizing.

And having come into Troas, for the gospel of Christ, and there being a door opened unto me in the Lord,