Matthew 16:5

And in the morning, It will be foul weather to day: for the sky is red and lowering. O ye hypocrites, ye can discern the face of the sky; but can ye not discern the signs of the times?

A wicked and adulterous generation seeketh after a sign; and there shall no sign be given unto it, but the sign of the prophet Jonas. And he left them, and departed.

Then Jesus said unto them, Take heed and beware of the leaven of the Pharisees and of the Sadducees.

And they reasoned among themselves, saying, It is because we have taken no bread.