Matthew 16:3-5

New Revised Standard Version Catholic Edition

³ And 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.^{[a] 4} An evil and adulterous generation asks for a sign, but no sign will be given to it except the sign of Jonah.” Then he left them and went away.

The Yeast of the Pharisees and Sadducees

⁵ When the disciples reached the other side, they had forgotten to bring any bread.