3 Bible Verses about Open Doors

Write also to the angel of the Church in Philadelphia. These things says He who is holy, he who is true, he who has the key of David, he who opens, and no one shall shut; and who shuts, and no one opens. I know your works. Lo, I have set before you an open door, which none can shut; for though you have only a little strength, you have kept my word, and have not denied my name.

for a door has opened to me, great and effectual, and the opponents are many.

Now when I came to Troas to preach the gospel of Christ, although a door was opened to me in the Lord,