New Living Translation
But the Jewish leaders demanded, “What are you doing? If God gave you authority to do this, show us a miraculous sign to prove it.”

American Standard Version
The Jews therefore answered and said unto him, What sign showest thou unto us, seeing that thou doest these things?

Berean Study Bible
On account of this, the Jews demanded, “What sign can You show us to prove Your authority to do these things?”

Douay-Rheims Bible
The Jews, therefore, answered, and said to him: What sign dost thou shew unto us, seeing thou dost these things?

English Revised Version
The Jews therefore answered and said unto him, What sign shewest thou unto us, seeing that thou doest these things?

King James Bible
Then answered the Jews and said unto him, What sign shewest thou unto us, seeing that thou doest these things?

World English Bible
The Jews therefore answered him, "What sign do you show us, seeing that you do these things?"

Young's Literal Translation
the Jews then answered and said to him, 'What sign dost thou shew to us -- that thou dost these things?'

John 2:18 Additional Translations ...