Pharisees and Sadducees would not have had much truck with one another. We might compare them to modern Hasidic Jews and secular Jews. Both Jews, but way different. But they came together in a common cause. They both began to recognize the danger of Jesus and his teaching. He was becoming to popular in Galilee and they could not afford an upset to the status quo.
Again they ask for a sign. Again Jesus says they have enough without another sign. He drops the mic and leaves with his disciples.
Jesus warns the disciples about the “leaven of the Pharisees and Sadducees. They are fumbling about thinking about bread, but Jesus is talking about how the skeptical opposition of the two groups will grow in the populace and will eventually be a big problem for Jesus.
He calls his disciples oligopistois again. Mea culpa.
This little passage kind of closes out a section of the gospel and kicks off a new one. Things will be coming to a head and the leaven of the Pharisees and Sadducees will have fully bloomed by the time Jesus and his troupe get to Judea.
Will the disciples get a clue?