The Bible

 

Exodus 23:18

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18 Thou shalt not offer the blood of my sacrifice with leavened bread; neither shall the fat of my sacrifice remain until the morning.

The Bible

 

Leviticus 23:39

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39 Also in the fifteenth day of the seventh month, when ye have gathered in the fruit of the land, ye shall keep a feast unto the LORD seven days: on the first day shall be a sabbath, and on the eighth day shall be a sabbath.

Commentary

 

Unleavened bread

  

In Genesis 19:3 and Exodus 12:15, this indicates something without impurities; for leaven signifies evil and falsity by which celestial and spiritual things become impure and profane. (Arcana Coelestia 2342)

'Unleavened bread' signifies the holiness of love, or the holy of holies. The baking of unleavened bread represents purification.