Matthew 16:1-4

Here the Pharisees and Sadducees came up, and, to test Jesus, requested him to show them some sign from the heavens.

Mark 8:11-12

Here the Pharisees came out, and began to argue with Jesus, asking him for some sign from the heavens, to test him.

Luke 11:29-30

As the crowds increased, Jesus began to speak: "This generation is a wicked generation. It is asking a sign, but no sign shall be given it except the sign of Jonah.

Treasury of Scripture Knowledge

Summary

And Isaiah said, This sign shalt thou have of the LORD, that the LORD will do the thing that he hath spoken: shall the shadow go forward ten degrees, or go back ten degrees?

Bible References

This sign

Matthew 16:1
Here the Pharisees and Sadducees came up, and, to test Jesus, requested him to show them some sign from the heavens.
Mark 8:11
Here the Pharisees came out, and began to argue with Jesus, asking him for some sign from the heavens, to test him.
Luke 11:29
As the crowds increased, Jesus began to speak: "This generation is a wicked generation. It is asking a sign, but no sign shall be given it except the sign of Jonah.