Matthew, Chapter 16 Vs 1-12
The Demand for a Sign.
1* a The Pharisees and Sadducees came and, to test him, asked him to show them a sign from heaven.2* He said to them in reply, "[In the evening you say, 'Tomorrow will be fair, for the sky is red';3b and, in the morning, 'Today will be stormy, for the sky is red and threatening.' You know how to judge the appearance of the sky, but you cannot judge the signs of the times.]4c An evil and unfaithful generation seeks a sign, but no sign will be given it except the sign of Jonah."* Then he left them and went away.
The Leaven of the Pharisees and Sadducees.5d In coming to the other side of the sea,* the disciples had forgotten to bring bread.6e Jesus said to them, "Look out, and beware of the leaven* of the Pharisees and Sadducees."7* They concluded among themselves, saying, "It is because we have brought no bread."8When Jesus became aware of this he said, "You of little faith, why do you conclude among yourselves that it is because you have no bread?9f Do you not yet understand, and do you not remember the five loaves for the five thousand, and how many wicker baskets you took up?10g Or the seven loaves for the four thousand, and how many baskets you took up?11How do you not comprehend that I was not speaking to you about bread? Beware of the leaven of the Pharisees and Sadducees."12Then they understood* that he was not telling them to beware of the leaven of bread, but of the teaching of the Pharisees and Sadducees.