Commentary for I Chronicles 24:6

וַֽיִּכְתְּבֵ֡ם שְֽׁמַֽעְיָה֩ בֶן־נְתַנְאֵ֨ל הַסּוֹפֵ֜ר מִן־הַלֵּוִ֗י לִפְנֵ֨י הַמֶּ֤לֶךְ וְהַשָּׂרִים֙ וְצָד֣וֹק הַכֹּהֵ֗ן וַאֲחִימֶ֙לֶךְ֙ בֶּן־אֶבְיָתָ֔ר וְרָאשֵׁי֙ הָֽאָב֔וֹת לַכֹּהֲנִ֖ים וְלַלְוִיִּ֑ם בֵּֽית־אָ֣ב אֶחָ֗ד אָחֻז֙ לְאֶלְעָזָ֔ר וְאָחֻ֥ז ׀ אָחֻ֖ז לְאִיתָמָֽר׃ (פ)

And Shemaiah the son of Nethanel the scribe, who was of the Levites, wrote them in the presence of the king, and the princes, and Zadok the priest, and Ahimelech the son of Abiathar, and the heads of the fathers’houses of the priests and of the Levites: one father’s house being taken for Eleazar, and proportionately for Ithamar.

Rashi on I Chronicles