1 Corinthians 1:22 For the Jews require a sign, and the Greeks seek after wisdom:

Acts 2:22 Ye men of Israel, hear these words; Jesus of Nazareth, a man approved of God among you by miracles and wonders and signs, which God did by him in the midst of you, as ye yourselves also know:

John 2:18 ¶Then answered the Jews and said unto him, What sign shewest thou unto us, seeing that thou doest these things?

Matthew 12:38 ¶Then certain of the scribes and of the Pharisees answered, saying, Master, we would see a sign from thee.