'Door' in the Bible

“Truly, truly, I say to you, he who does not enter by the door into the fold of the sheep, but climbs up some other way, he is a thief and a robber.

But he who enters by the door is a shepherd of the sheep.

So Jesus said to them again, “Truly, truly, I say to you, I am the door of the sheep.

I am the door; if anyone enters through Me, he will be saved, and will go in and out and find pasture.

but Peter was standing at the door outside. So the other disciple, who was known to the high priest, went out and spoke to the doorkeeper, and brought Peter in.

Then the slave-girl who kept the door *said to Peter, “You are not also one of this man’s disciples, are you?” He *said, “I am not.”