Matthew 16:1

1The Pharisees and Sadducees came, and testing him, asked him to show them a sign from heaven.

2But he answered them, “When it is evening, you say, ‘It will be fair weather, for the sky is red.’

3In the morning, ‘It will be foul weather today, for the sky is red and threatening.’ Hypocrites! You know how to discern the appearance of the sky, but you can’t discern the signs of the times!