'Open Door' in the Bible

The gift of a person will open doors for him, and before the great, it gives him access.

If she be a wall, we shall build a silver bulwark thereupon: if she be an open door, we shall fasten her with boards of Cedar tree.

This is what the Lord says to His anointed, to Cyrus [king of Persia],Whose right hand I have heldTo subdue nations before him,And I will ungird the loins of kings [disarming them];To open doors before him so that gates will not be shut:

Now when I came to Troas for the good news of Christ, and there was an open door for me in the Lord,

And making prayer for us, that God may give us an open door for the preaching of the word, the secret of Christ, for which I am now in chains;

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.

After these [things] I looked, and behold, an open door in heaven, and the former voice that I had heard like a trumpet speaking with me was saying, "Come up here and I will show you [the things] which must take place after these [things]."