3 Bible Verses about Open Doors

And to the angel of the church in Philadelphia write, These things says the Holy One, the True, he that has the key of David, he that opens and no one shall shut, and shuts and no one shall open, I know your works; behold, I have placed before you an opened door, which no man can shut; because you have a little power, and kept my word, and did not deny my name.

for a great and effectual door is opened to me, and there are many adversaries.

But when I came to Troas for the gospel of Christ, and a door was opened to me by the Lord,