Do they, perchance, wait for the angels to appear unto them, or for thy Sustainer [Himself] to appear, or for some of thy Sustainer's [final] portents to appear? [But] on the Day when thy Sustainer's [final] portents do appear, believing will be of no avail to any human being who did not believe before, or who, while believing, did no good works. Say: "Wait, [then, for the Last Day, O unbelievers:] behold, we [believers] are waiting, too!"