Matthew 16:1-4

1And the Pharisees and Sadducees came, and to test him they asked him to show them a sign from heaven.

2He answered them, "When it is evening, you say, 'It will be fair weather, for the sky is red.'

3And in the morning, 'It will be stormy today, for the sky is red and threatening.' You know how to interpret the appearance of the sky, but you cannot interpret the signs of the times.

4An evil and adulterous generation seeks for a sign, but no sign will be given to it except the sign of Jonah." So he left them and departed.