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

Matthew 16:1 The Pharisees also with the Sadducees came, and tempting desired him that he would shew them a sign from heaven.

Mark 8:11 And the Pharisees came forth, and began to question with him, seeking of him a sign from heaven, tempting him.

Luke 11:29 ¶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.

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

Hebrews 3:9 When your fathers tempted me, proved me, and saw my works forty years.

Hebrews 3:19 So we see that they could not enter in because of unbelief.