Luke 18:7
And will not God bring about justice for his chosen ones, who cry out to him day and night? Will he keep putting them off? — the lesser-to-greater argument: if the unjust judge responds to persistence, will God — who is just and who loves his chosen ones — not bring justice? Day and night: the persistence of the prayer matches the persistence of the widow. Will he keep putting them off: the implication is no, while acknowledging the apparent delay.