Isaiah 7:11

7:11 “Ask for a confirming sign from the Lord your God. You can even ask for something miraculous.”

Matthew 12:39

12:39 But he answered them, “An evil and adulterous generation asks for a sign, but no sign will be given to it except the sign of the prophet Jonah.

John 2:18

2:18 So then the Jewish leaders responded, “What sign can you show us, since you are doing these things?”

John 6:30

6:30 So they said to him, “Then what miraculous sign will you perform, so that we may see it and believe you? What will you do?

John 10:38

10:38 But if I do them, even if you do not believe me, believe the deeds, so that you may come to know and understand that I am in the Father and the Father is in me.”