Matthew 16:4-6

New Revised Standard Version Catholic Edition

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. ⁶ Jesus said to them, “Watch out, and beware of the yeast of the Pharisees and Sadducees.”