Luke 11:29-30

As the crowds continued to swell, Jesus went on to say, “How evil is this generation! When you demand a mighty display of power simply to prove who I am, you demonstrate your unbelief. The only sign you will see will be a repeat of the miracle of Jonah. In the same way Jonah became a sign to the people of Nineveh, so the Son of Man will be a sign to this generation.