Therefore they said to Him, What sign (miracle, wonderwork) will You perform then, so that we may see it and believe and rely on and adhere to You? What [supernatural] work have You [to show what You can do]?
Now as the crowds were [increasingly] thronging Him, He began to say, This present generation is a wicked one; it seeks and demands a sign (miracle), but no sign shall be given to it except the sign of Jonah [the prophet]. [Jonah 1:17; Matt. 12:40.]
This they said to try (test) Him, hoping they might find a charge on which to accuse Him. But Jesus stooped down and wrote on the ground with His finger.