TSK
Treasury of Scripture Knowledge references in NET.
For seven days you must eat bread made without yeast. Surely on the first day you must put away yeast from your houses because anyone who eats bread made with yeast from the first day to the seventh day will be cut off from Israel.
Then they understood that he had not told them to be on guard against the yeast in bread, but against the teaching of the Pharisees and Sadducees.
Fear God, Not People Meanwhile, when many thousands of the crowd had gathered so that they were trampling on one another, Jesus began to speak first to his disciples,“Be on your guard against the yeast of the Pharisees, which is hypocrisy.
So the disciples began to say to one another,“No one brought him anything to eat, did they?”
A little yeast makes the whole batch of dough rise!