'Door' in the Bible

And I will have the locks of the door of Damascus broken, and him who is seated in power cut off from the valley of Aven, and him in whose hand is the rod from the house of Eden; and the people of Aram will go away as prisoners into Kir, says the Lord.

The Lord said to me, “Amos, what do you see?” And I said, “A plumb line.” Then the Lord said,“Behold, I am setting a plumb line [as a standard]Among My people Israel [showing the defectiveness of the nation, requiring judgment].I shall not spare them any longer. [The door of mercy is shut.]

I saw the Lord standing upon the altar: and he said, Smite the lintel of the door, that the posts may shake: and cut them in the head, all of them; and I will slay the last of them with the sword: he that fleeth of them shall not flee away, and he that escapeth of them shall not be delivered.