Matthew 16:1-4

AND the Pharisees and Sadducees coming to Jesus to try him desired him to show them a sign from heaven.

Mark 8:11-12

And the Pharisees went out and questioned him, seeking of him a sign from heaven, to try him.

Luke 11:29-30

And multitudes being assembled, he said, This generation is an evil generation. It seeks for a sign, and no sign shall be given it but 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
AND the Pharisees and Sadducees coming to Jesus to try him desired him to show them a sign from heaven.
Mark 8:11
And the Pharisees went out and questioned him, seeking of him a sign from heaven, to try him.
Luke 11:29
And multitudes being assembled, he said, This generation is an evil generation. It seeks for a sign, and no sign shall be given it but the sign of Jonah.