Matthew 16:1–12

And there came to him the Pharisees and Sadducees tempting: and they asked him to shew them a sign from heaven.

²But he answered and said to them: When it is evening, you say, It will be fair weather, for the sky is red.

³And in the morning: To day there will be a storm, for the sky is red and lowering. You know then how to discern the face of the sky: and can you not know the signs of the times?

⁴A wicked and adulterous generation seeketh after a sign: and a sign shall not be given it, but the sign of Jonas the prophet. And he left them, and went away.

⁵And when his disciples were come over the water, they had forgotten to take bread.

⁶Who said to them: Take heed and beware of the leaven of the Pharisees and Sadducees.

⁷But they thought within themselves, saying: Because we have taken no bread.

⁸And Jesus knowing it, said: Why do you think within yourselves, O ye of little faith, for that you have no bread?

⁹Do you not yet understand, neither do you remember the five loaves among five thousand men, and how many baskets you took up?

¹⁰Nor the seven loaves, among four thousand men, and how many baskets you took up?

¹¹Why do you not understand that it was not concerning bread I said to you: Beware of the leaven of the Pharisees and Sadducees?

¹²Then they understood that he said not that they should beware of the leaven of bread, but of the doctrine of the Pharisees and Sadducees.