וּפְדוּיָו֙ מִבֶּן־חֹ֣דֶשׁ תִּפְדֶּ֔ה בְּעֶ֨רְכְּךָ֔ כֶּ֛סֶף חֲמֵ֥שֶׁת שְׁקָלִ֖ים בְּשֶׁ֣קֶל הַקֹּ֑דֶשׁ עֶשְׂרִ֥ים גֵּרָ֖ה הֽוּא׃
And their redemption-money—from a month old shalt thou redeem them—shall be, according to thy valuation, five shekels of silver, after the shekel of the sanctuary—the same is twenty gerahs.
Read kabbalistic (mystical) interpretation of Numbers 18:16: and classical mystical sources.