Matthew 12:38

And the Pharisees and Sadducees came, and testing Him, they asked Him to show them a sign from heaven.

And the Pharisees came out and began to argue with Him, seeking from Him a sign from heaven, testing Him.

And others, testing Him, were seeking from Him a sign from heaven.

Now as the crowds were increasing, He began to say, “This generation is a wicked generation; it seeks a sign, and yet no sign will be given to it but the sign of Jonah.

The Jews then said to Him, “What sign do You show us as your authority for doing these things?”

So they said to Him, “What then do You do for a sign so that we may see, and believe You? What work do You perform?

For indeed Jews ask for signs and Greeks search for wisdom,

The Sign of Jonah