וְעִמְד֣וּ בַקֹּ֗דֶשׁ לִפְלֻגּוֹת֙ בֵּ֣ית הָֽאָב֔וֹת לַאֲחֵיכֶ֖ם בְּנֵ֣י הָעָ֑ם וַחֲלֻקַּ֥ת בֵּֽית־אָ֖ב לַלְוִיִּֽם׃
Rashi on II Chronicles
according to the divisions in divisions to make the Passover sacrifice according to its law, according to the word of the Lord by the hand of Moses.