Matthew 16:1-4

And the Pharisees and Sadducees came, and trying him asked him to show them a sign from heaven. But he answered and said unto them, When it is evening, ye say, It will be fair weather: for the heaven is red. And in the morning, It will be foul weather to-day: for the heaven is red and lowering. Ye know how to discern the face of the heaven; but ye cannot discern the signs of the times. An evil and adulterous generation seeketh after a sign; and there shall no sign be given unto it, but the sign of Jonah. And he left them, and departed.