אֵ֗לֶּה בִּקְשׁ֧וּ כְתָבָ֛ם הַמִּתְיַחְשִׂ֖ים וְלֹ֣א נִמְצָ֑אוּ וַֽיְגֹאֲל֖וּ מִן־הַכְּהֻנָּֽה׃
These sought their register, that is, the genealogy, but it was not found; therefore were they deemed polluted and put from the priesthood.
Read midrashic interpretation of Ezra 2:62: and classical rabbinic exegesis.