I Chronicles 18:16 Midrash

וְצָד֧וֹק בֶּן־אֲחִיט֛וּב וַאֲבִימֶ֥לֶךְ בֶּן־אֶבְיָתָ֖ר כֹּהֲנִ֑ים וְשַׁוְשָׁ֖א סוֹפֵֽר׃

And Zadok the son of Ahitub, and Abimelech the son of Abiathar, were priests; and Shavsha was scribe;