Expanding the Sacred Weight of the Sanctuary Shekel

How a seemingly redundant verb in Leviticus gives the court the power to increase the biblical currency used for sacred obligations.

וְכׇ֨ל־עֶרְכְּךָ֔ יִהְיֶ֖ה בְּשֶׁ֣קֶל הַקֹּ֑דֶשׁ עֶשְׂרִ֥ים גֵּרָ֖ה יִהְיֶ֥ה הַשָּֽׁקֶל׃

All assessments shall be by the sanctuary weight, the shekel being twenty gerahs. (Leviticus 27:25)

The Fixed Weight of the Sanctuary

In the final chapter of Leviticus, the Torah concludes the laws of personal valuations and consecrated land. To ensure integrity across all sacred pledges, Scripture establishes a uniform currency for these holy valuations.

Rashi explains that whenever the Torah specifies monetary valuations in shekels, one must use this sacred standard of measurement. In its plain meaning, the verse fixes the holy shekel at exactly twenty biblical grains (גרה, gera), ensuring a reliable and honest transaction for the Sanctuary.

וְכׇ֨ל־עֶרְכְּךָ֔ יִהְיֶ֖ה בְּשֶׁ֣קֶל הַקֹּ֑דֶשׁ עֶשְׂרִ֥ים גֵּרָ֖ה יִהְיֶ֥ה הַשָּֽׁקֶל׃

All assessments shall be by the sanctuary weight, the shekel being twenty gerahs. (Leviticus 27:25)

A Discrepancy in the Shekel's Value

In the Gemara, Rava calculates that the original biblical coin (סלע, sela) weighs three and one-third Tyrian dinars. The Torah defines the shekel as twenty גרה, which the Aramaic Targum translates as twenty silver pennies (מעין, ma'in). Since a baraita teaches that a single dinar equals six silver מעין, twenty מעין equal three and one-third dinars.

The Gemara immediately raises a challenge from another baraita discussing the redemption of an ancestral field. That text states that a sacred sela contains forty-eight small copper units (פונדיונין, pundeyonin), which equals twenty-four מעין or four full dinars. If the biblical shekel contains twenty מעין, how could the baraita claim the sanctuary sela contains twenty-four מעין?

אָמַר רָבָא: סִילְעִים דְּאוֹרָיְיתָא תְּלָתָא וְתִילְתָּא הָוֵי, דִּכְתִיב: ״עֶשְׂרִים גֵּרָה הַשֶּׁקֶל״

Rava says: The biblical sela coins... are each three and one-third dinars in weight... as it is written: 'The shekel is twenty gera.' (Bekhorot 50a:3)

The Power of a Single Word

The Gemara resolves this contradiction by explaining that the baraita describes the coin after the Sages augmented it. The authorities added one-sixth to the weight of the biblical sela, raising it to twenty-four מעין to match the circulating Tyrian currency.

The Gemara asks how the authorities possess the legal right to alter a biblically defined coin. It points to the unusual phrasing in Leviticus 27:25, which states: "Twenty gera shall be (יִהְיֶה) the shekel". Rashi explains that the future tense "shall be" implies another future standard of existence, granting the court authority to expand the coin's weight.

Yet this authority is strictly one-directional. The court may never devalue the coin below its biblical foundation. Scripture in Numbers 18:16 uses the restrictive term "it is" (הוּא), establishing that twenty gera is a permanent floor that can never be diminished.

וּמִנַּיִן שֶׁאִם רָצָה לְהוֹסִיף יוֹסִיף? תַּלְמוּד לוֹמַר: ״יִהְיֶה״, יָכוֹל יִפְחוֹת? תַּלְמוּד לוֹמַר: ״הוּא״.

And from where is it derived that if one wants to add to it, he may add? The verse states: 'Shall be.' One might have thought he may reduce it; therefore the verse states: 'It is.' (Bekhorot 50a:6)

Redeeming the Firstborn Son

This derashah directly dictates the practical cost of the redemption of the firstborn son (פדיון הבן, pidyon haben). The Torah requires a father to redeem his firstborn for five silver shekels. Under the baseline Torah measurement of three and one-third dinars per shekel, the statutory cost would be sixteen and two-thirds dinars.

The Gemara illustrates this practical application when Rav Ashi sent seventeen dinars to Rav Acha, son of Ravina, who was a priest (כהן, kohen). Rav Ashi asked for the extra one-third of a dinar to be returned. However, Rav Acha replied that because the Sages enlarged the sela using the biblical mandate of "shall be," five selas now equal twenty full dinars.

שְׁלַח לֵיהּ: לִישַׁדַּר לִי מָר תִּלְתָּא יַתִּירְתָּא דְּאִיכָּא עִלָּוַיְיהוּ. שְׁלַח לֵיהּ: לְשַׁדַּר לִי מָר תְּלָתָא אַחֲרִינָא דְּאוֹסִיפוּ עִילָּוַיְיהוּ!

He sent to him: 'Let the Master send me back the extra one-third.' He responded: 'Let the Master send me the other three dinars that they added!' (Bekhorot 50a:7)

The word 'shall be' teaches that while the court may increase the weight of the sanctuary shekel, its original biblical measure remains an unbreakable floor.

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