Then the Jews addressed him and said, "What sign have you to show us, for acting in this way?"

This second sign Jesus showed after coming back from Judea to Galilee.

Then they said to him, "Then what sign do you show for us to see and so come to believe you? What work are you doing?

And people came to him in great numbers, and they said of him, "John did not show any sign in proof of his mission, but all that he said about this man was true."

That was why the crowd went out to meet him, because they heard that he had showed that sign.