פירוש על עבודה זרה 66:15

The previous baraita ruled that if a Jew buys used earthenware wine bottles from an idolater, he may put brine and murias in them. Here the Talmud asks whether the baraita meant that if he put brine and murias into them, the brine is not ex post facto prohibited, but that he should not do so. Or is he completely allowed to do so. R. Zevid’s baraita states even more clearly that he is allowed to put in the brine “ab initio” or “lechatchila” in Hebrew.