Theodoret of Cyrus
It further reveals that the high priest Sadok descended from Eleazar, while Abimelech came from the line of Ithamar.
And David distributed them, that is, Sadoc of the sons of Eleazar, and Ahimelech of the sons of Ithamar, according to their courses and ministry.
וַיֶּֽחָלְקֵ֣ם דָּוִ֔יד וְצָדוֹק֙ מִן־בְּנֵ֣י אֶלְעָזָ֔ר וַאֲחִימֶ֖לֶךְ מִן־בְּנֵ֣י אִיתָמָ֑ר לִפְקֻדָּתָ֖ם בַּעֲבֹדָתָֽם׃
One Church Father comments on this verse
It further reveals that the high priest Sadok descended from Eleazar, while Abimelech came from the line of Ithamar.
Passages read together with this verse.