The Jews then responded to him, "What sign can you show us to prove your authority to do all this?"
Then the Jews retorted, What sign can You show us, seeing You do these things? [What sign, miracle, token, indication can You give us as evidence that You have authority and are commissioned to act in this way?]AMP
Then answered the Jews and said unto him, What sign shewest thou unto us, seeing that thou doest these things?
As the crowds increased, Jesus said, "This is a wicked generation. It asks for a sign, but none will be given it except the sign of Jonah."
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.]AMP
And when the people were gathered thick together, he began to say, This is an evil generation: they seek a sign; and there shall no sign be given it, but the sign of Jonas the prophet.
After the people saw the sign Jesus performed, they began to say, "Surely this is the Prophet who is to come into the world."
When the people saw the sign (miracle) that Jesus had performed, they began saying, Surely and beyond a doubt this is the Prophet Who is to come into the world! [Deut. 18:15, 18; John 1:21; Acts 3:22.]AMP
Then those men, when they had seen the miracle that Jesus did, said, This is of a truth that prophet that should come into the world.