Matthew 16:3-7

And in the morning, ‘There will be a storm today, for the sky is red and threatening.’ You know how to discern the appearance of the sky, but are you unable to discern the signs of the times?

An evil and adulterous generation wants a sign; and so a sign will not be given to it, except the sign of Jonah.” And He left them and went away.

And the disciples came to the other side of the sea, but they had forgotten to bring any bread.

And Jesus said to them, “Watch out and beware of the leaven of the Pharisees and Sadducees.”

They began to discuss this among themselves, saying, “He said that because we did not bring any bread.”