Jesus talks about the yeast of the Pharisees and the yeast of Herod
14 Jesus' disciples had forgotten to take bread with them. They only had one loaf in the boat. 15 Jesus said to them, ‘Be careful. Do not accept the yeast of the Pharisees and the yeast of Herod.’
8:15People put yeast into flour and water when they want to make bread. The yeast grows and it causes the flour to become bigger. Then it is more like a loaf of bread. Then you can bake the bread and you can eat it. Jesus was not talking to them about the yeast that people use to make bread. He was talking about the things that the Pharisees taught to the people. See Matthew 16:12.
16 The disciples began to talk to each other. ‘Jesus is saying that because we do not have any bread,’ they said.
17 Jesus knew what they were talking about. So he said to them, ‘You should not be arguing about the bread. You still do not understand my teaching. You seem unable to learn. 18 You are like people who have eyes but they cannot see with them. You are like people who have ears but they cannot hear with them. 19 Remember that I used five loaves of bread to feed 5,000 men. How many baskets did you fill with pieces of food that were left?’
‘There were 12 baskets,’ they replied.
20 Jesus asked them, ‘I also used seven loaves to feed 4,000 people. That time, how many baskets did you fill with pieces of food?’
‘There were seven baskets,’ they replied.
21 ‘You really should understand about me now,’ he said to them.