'Knock' in the Bible

“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.

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].’

Behold, I stand at the door [of the church] and continually knock. If anyone hears My voice and opens the door, I will come in and eat with him (restore him), and he with Me.