וְלָקַחְתָּ֗ חֲמֵ֧שֶׁת חֲמֵ֛שֶׁת שְׁקָלִ֖ים לַגֻּלְגֹּ֑לֶת בְּשֶׁ֤קֶל הַקֹּ֙דֶשׁ֙ תִּקָּ֔ח עֶשְׂרִ֥ים גֵּרָ֖ה הַשָּֽׁקֶל׃
engkau harus mengambil lima syikal per kepala; engkau harus mengambilnya menurut syikal kudus, dua puluh gera satu syikal.
Rashbam
תפדה, after the Levites had been sanctified to take the place of the firstborn who had participated in the sin of the golden calf, in the second year after the Tabernacle had been erected and inaugurated. At that time you will take 5 shekalim per head (Numbers 3,47) to effect this exchange. It included Levites of one month and up (males) Numbers 18,16)