John 2:18
So, the Jews asked Him, "What [miraculous] sign will you show us, since you are doing these things [i.e., disrupting their merchandising activities]?"
John 6:30
And they said to Him, "What kind of a [miraculous] sign will you perform so that we can see it and [then] believe [in] you? What [kind of] deed will you perform?
Matthew 12:39
But He said to them, "It is [only] an evil and unfaithful [i.e., to God] generation of people that looks for a [supernatural] sign. And there will not be any sign given to it except the [supernatural] sign [demonstrated in the life] of Jonah, the prophet.
John 10:38
But if I am doing them, even though you do not believe me, believe the deeds. Then you will know and continue to know that the Father is in me, and that I am in the Father."