Ezekiel 44:21 Midrash

וְיַ֥יִן לֹֽא־יִשְׁתּ֖וּ כָּל־כֹּהֵ֑ן בְּבוֹאָ֖ם אֶל־הֶחָצֵ֥ר הַפְּנִימִֽית׃

Neither shall any priest drink wine, when they enter into the inner court.

Read midrashic interpretation of Ezekiel 44:21: and classical rabbinic exegesis.