Luke 11:16

11:16 Others, to test him, began asking for a sign from heaven.

Luke 11:29-30

The Sign of Jonah

11:29 As the crowds were increasing, Jesus began to say, “This generation is a wicked generation; it looks for a sign, but no sign will be given to it except the sign of Jonah. 11:30 For just as Jonah became a sign to the people of Nineveh, so the Son of Man will be a sign to this generation.