A non-Jew and a Cuthean: their terumah is terumah, and their tithes are tithes, and their items of consecration are consecrat-ed. R' Yehudah says: A non-Jew does not have revai of vineyards. But the Sages say: He does have [revai of vineyards]. The terumah of a non-Jew creates a dimua mixture, and we are liable to an additional “fifth” for [eating] it. But R' Shimon exempts.