Matthew 16:1-4

And the Pharisees and Sadducees came to try him, and asked him to show them a sign from heaven.

Mark 8:11-12

And the Pharisees came out, and began to question with him, seeking of him a sign from heaven, trying him.

Luke 11:29-30

And when the crowds were thronging about him, he began to say, This generation is a wicked generation; it seeketh a sign; and no sign will 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 came to try him, and asked him to show them a sign from heaven.
Mark 8:11
And the Pharisees came out, and began to question with him, seeking of him a sign from heaven, trying him.
Luke 11:29
And when the crowds were thronging about him, he began to say, This generation is a wicked generation; it seeketh a sign; and no sign will be given it, but the sign of Jonah.