Therefore let us keep the feast, not with old yeast, neither with the yeast of malice and wickedness, but with the unleavened bread of sincerity and truth.

"'Seven days you shall eat unleavened bread; even the first day you shall put away yeast out of your houses, for whoever eats leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.

Unleavened bread shall be eaten throughout the seven days; and no leavened bread shall be seen with you, neither shall there be yeast seen with you, in all your borders.

You shall bring out of your habitations two loaves of bread for a wave offering made of two tenth parts of an ephah of fine flour. They shall be baked with yeast, for first fruits to the LORD.

Why is it that you do not understand that I did not speak to you concerning bread? But beware of the yeast of the Pharisees and Sadducees."

Then they understood that he did not tell them to beware of the yeast of bread, but of the teaching of the Pharisees and Sadducees.