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Some Pharisees and Sadducees were on him again, pressing him to prove himself to them.
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He told them, "You have a saying that goes, 'Red sky at night, sailor's delight;
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red sky at morning, sailors take warning.' You find it easy enough to forecast the weather - why can't you read the signs of the times?
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An evil and wanton generation is always wanting signs and wonders. The only sign you'll get is the Jonah sign." Then he turned on his heel and walked away.
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On their way to the other side of the lake, the disciples discovered they had forgotten to bring along bread.
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In the meantime, Jesus said to them, "Keep a sharp eye out for Pharisee-Sadducee yeast."
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Thinking he was scolding them for forgetting bread, they discussed in whispers what to do.
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Jesus knew what they were doing and said, "Why all these worried whispers about forgetting the bread? Runt believers!
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Haven't you caught on yet? Don't you remember the five loaves of bread and the five thousand people, and how many baskets of fragments you picked up?
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Or the seven loaves that fed four thousand, and how many baskets of leftovers you collected?
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Haven't you realized yet that bread isn't the problem? The problem is yeast, Pharisee-Sadducee yeast."
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Then they got it: that he wasn't concerned about eating, but teaching - the Pharisee-Sadducee kind of teaching.