'Knocking' in the Bible

“Keep asking, and it will be given to you. Keep searching, and you will find. Keep knocking, and the door will be opened to you.

“So I say to you, keep asking, and it will be given to you. Keep searching, and you will find. Keep knocking, and the door will be opened to you.

Peter, however, kept on knocking, and when they opened the door and saw him, they were astounded.