וְאֵ֣לֶּה הַ֠מְשֹׁרְרִים רָאשֵׁ֨י אָב֧וֹת לַלְוִיִּ֛ם בַּלְּשָׁכֹ֖ת פטירים [פְּטוּרִ֑ים] כִּֽי־יוֹמָ֥ם וָלַ֛יְלָה עֲלֵיהֶ֖ם בַּמְּלָאכָֽה׃
And these are the singers, heads of fathers’ houses of the Levites, who dwelt in the chambers and were free from other service; for they were employed in their work day and night.
I Chronicles
And these are the ones that David appointed to sing in the house of the L-rd from [the time that] the ark came to rest [in Jerusalem].