Passover
Interpretations for abstinence from leaven or yeast

Some scholars suggest that the command to abstain from leavened food or yeast suggests that sacrifices offered to God involve the offering of objects in "their least altered state", that would be nearest to the way in which they were initially made by God. According to other scholars the absence of leaven or yeast means that leaven or yeast symbolizes corruption and spoiling.

There are also variations with restrictions on eating matzah before Passover so that there will be an increased appetite for it during Passover itself. Primarily among Chabad Chassidim, there is a custom of not eating matzah (flat unleavened bread) in the 30 days before Passover begins. Others have a custom to refrain from eating matzah from Rosh Chodesh Nissan, while the halacha merely restricts one from eating matzah on the day before Passover.
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