וַיֵּצֵ֞א הַגּוֹרָ֧ל הָרִאשׁ֛וֹן לְאָסָ֖ף לְיוֹסֵ֑ף גְּדַלְיָ֙הוּ֙ הַשֵּׁנִ֔י הֽוּא־וְאֶחָ֥יו וּבָנָ֖יו שְׁנֵ֥ים עָשָֽׂר׃
第一籤抽中屬亞薩的約瑟；第二籤是基大利，他和他的弟兄、兒子共十二人。
English Explanation of Mishnah Arakhin
There were never less than twelve levites standing on the platform and their number could be increased into infinity. There always needed to be twelve Levites standing on the platform in the Temple singing. This would mean one for every lyre (nine), one for every harp (two) and one for the cymbals. This number is also referred to in I Chronicles 25:9.