Reference for Leviticus 27:13

וְאִם־גָּאֹ֖ל יִגְאָלֶ֑נָּה וְיָסַ֥ף חֲמִישִׁת֖וֹ עַל־עֶרְכֶּֽךָ׃

But if he will indeed redeem it, then he shall add the fifth part thereof unto thy valuation.

Jastrow

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