The Parable of the persistent widow/the parable of the unjust judge
Luke 11:5-10 And He said to them, Which of you shall have a friend, and go to him at midnight and say to him, Friend, lend me three loaves; for a friend of mine has come to me on his journey, and I have nothing to set before him; and he will answer from within and say, Do not trouble me; the door is now shut, and my children are with me in bed; I cannot rise and give to you? I say to you, though he will not rise and give to him because he is his friend, yet because of his persistence he will rise and give him as many as he needs. So I say to you, ask, and it will be given to you; seek, and you will find; knock, and it will be opened to you. For everyone who asks receives, and he who seeks finds, and to him who knocks it will be opened.