מִבֶּ֨ן שְׁלֹשִׁ֤ים שָׁנָה֙ וָמַ֔עְלָה וְעַ֖ד בֶּן־חֲמִשִּׁ֣ים שָׁנָ֑ה כָּל־הַבָּא֙ לַצָּבָ֔א לַעֲבֹדָ֖ה בְּאֹ֥הֶל מוֹעֵֽד׃
삼십 세 이상으로 오십 세까지 회막 봉사에 입참하여 일할만한 모든 자라
Rashi
ופקדיו אשר צוה ה' את משה — This means, and those appointed by him (Moses) were appointed under the terms of the command which God had given to Moses (v. 43): from thirty years to fifty years old.