Strong's Hebrew: 7603. שְׂאֹר (seor) -- Leaven
Strong's Lexicon
seor: Leaven
Original Word: שְׂאֹר
Part of Speech: Noun Masculine
Transliteration: s'or
Pronunciation: seh-ore'
Phonetic Spelling: (seh-ore')
Definition: Leaven
Meaning: barm, yeast-cake
Word Origin: Derived from the root שָׁאַר (sha'ar), meaning "to remain" or "to leave over."
Corresponding Greek / Hebrew Entries: - G2219 (ζύμη, zyme): Refers to leaven or yeast in the New Testament, often used metaphorically to describe the pervasive nature of sin or false teaching (e.g., Matthew 16:6, 1 Corinthians 5:6).
Usage: The term "seor" refers to leaven, a substance used in dough to make it rise, typically yeast or a similar fermenting agent. In the Hebrew Bible, "seor" is often used in the context of prohibitions against leaven during certain religious observances, particularly the Feast of Unleavened Bread (Chag HaMatzot).
Cultural and Historical Background: In ancient Israelite culture, leaven was a common ingredient in bread-making. However, during specific religious festivals, such as Passover, the Israelites were commanded to remove all leaven from their homes and eat unleavened bread. This practice commemorated the haste with which the Israelites left Egypt, not having time to let their bread rise. Leaven also symbolically represented sin and corruption, as a small amount can permeate and affect the whole batch of dough.
NAS Exhaustive Concordance
Word Origin
from an unused word
Definition
leaven
NASB Translation
leaven (5).
Brown-Driver-Briggs
שְׂאֹר noun masculineExodus 12:19 leaven; — absolute ׳שׂ Exodus 13:7 (J), Deuteronomy 16:4 (D), Exodus 12:15,19; Leviticus 2:11 (all P).
שְׂאֵת see נשׂא. שָׂב see שׂיב.
שׂבךְ (√ of following; interweave; Late Hebrew סָבַךְ, derived species, שְׂבָכָה hair-net, etc.; Arabic 
insert, interewave; Syriac 
rush in, adhere, embrace, be mixed with, 
velum reticulatum; compare Assyrian šabikû, headdress, DlHWB 638).
Strong's Exhaustive Concordance
leaven
From sha'ar; barm or yeast-cake (as swelling by fermentation) -- leaven.
see HEBREW sha'ar
Forms and Transliterations
שְּׂאֹ֖ר שְׂאֹ֕ר שְׂאֹ֖ר שְׂאֹ֛ר שְׂאֹר֙ שאר śə’ōr śə·’ōr seOr
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Englishman's Concordance
Exodus 12:15
HEB: הָרִאשׁ֔וֹן תַּשְׁבִּ֥יתוּ שְּׂאֹ֖ר מִבָּתֵּיכֶ֑ם כִּ֣י ׀
NAS: you shall remove leaven from your houses;
KJV: ye shall put away leaven out of your houses:
INT: the first shall remove leaven your houses for
Exodus 12:19
HEB: שִׁבְעַ֣ת יָמִ֔ים שְׂאֹ֕ר לֹ֥א יִמָּצֵ֖א
NAS: there shall be no leaven found
KJV: days shall there be no leaven found
INT: Seven days leaven shall be no found
Exodus 13:7
HEB: יֵרָאֶ֥ה לְךָ֛ שְׂאֹ֖ר בְּכָל־ גְּבֻלֶֽךָ׃
NAS: among you, nor shall any leaven be seen
KJV: be seen with thee, neither shall there be leaven seen
INT: nor be seen leaven all your borders
Leviticus 2:11
HEB: כִּ֤י כָל־ שְׂאֹר֙ וְכָל־ דְּבַ֔שׁ
NAS: any leaven or any
KJV: for ye shall burn no leaven, nor any honey,
INT: or any leaven any honey
Deuteronomy 16:4
HEB: יֵרָאֶ֨ה לְךָ֥ שְׂאֹ֛ר בְּכָל־ גְּבֻלְךָ֖
NAS: no leaven shall be seen
KJV: And there shall be no leavened bread seen
INT: no shall be seen leaven all your territory