'Door' in the Bible

'Verily, verily, I say to you, He who is not entering through the door to the fold of the sheep, but is going up from another side, that one is a thief and a robber;

and he who is entering through the door is shepherd of the sheep;

Jesus said therefore again to them, 'Verily, verily, I say to you -- I am the door of the sheep;

I am the door, through me if any one may come in, he shall be saved, and he shall come in, and go out, and find pasture.

and Peter was standing at the door without, therefore went forth the other disciple who was known to the chief priest, and he spake to the female keeping the door, and he brought in Peter.

Then said the maid keeping the door to Peter, 'Art thou also of the disciples of this man?' he saith, 'I am not;'