'Door' in the Bible

“I assure you and most solemnly say to you, he who does not enter by the door into the sheepfold, but climbs up from some other place [on the stone wall], that one is a thief and a robber.

But he who enters by the door is the shepherd of the sheep [the protector and provider].

The doorkeeper opens [the gate] for this man, and the sheep hear his voice and pay attention to it. And [knowing that they listen] he calls his own sheep by name and leads them out [to pasture].

So Jesus said again, “I assure you and most solemnly say to you, I am the Door for the sheep [leading to life].

I am the Door; anyone who enters through Me will be saved [and will live forever], and will go in and out [freely], and find pasture (spiritual security).

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

Then the servant girl who kept the door said to Peter, “You are not one of this Man’s disciples, are you?” He said, “I am not.”