The Pharisees and Sadducees came up, and testing Jesus, they asked Him to show them a sign from heaven.
But He replied to them, "When it is evening, you say, '[It will be] fair weather, for the sky is red.'
"And in the morning, '[There will be] a storm today, for the sky is red and threatening.' Do you know how to discern the appearance of the sky, but cannot [discern] the signs of the times?
"An evil and adulterous generation seeks after a sign; and a sign will not be given it, except the sign of Jonah." And He left them and went away.