'Door' in the Bible

and from inside he answers, ‘Do not bother me; the door has already been shut and my children and I are in bed; I cannot get up and give you anything.’

“So I say to you, ask and keep on asking, and it will be given to you; seek and keep on seeking, and you will find; knock and keep on knocking, and the door will be opened to you.

For everyone who keeps on asking [persistently], receives; and he who keeps on seeking [persistently], finds; and to him who keeps on knocking [persistently], the door will be opened.

“Strive to enter through the narrow door [force aside unbelief and the attractions of sin]; for many, I tell you, will try to enter [by their own works] and will not be able.

Once the head of the house gets up and closes the door, and you begin to stand outside and knock on the door [again and again], saying, ‘Lord, open to us!’ then He will answer you, ‘I do not know where you are from [for you are not of My household].’