Avodah Zarah 60A

ואידך שרי, ואיכא דאמרי, אמר רב פפא: עד (הברזא) [ברזא] ⁠— חמרא אסיר, ואידך שרי.

but the other wine in the jug is permitted. There are those who say that Rav Pappa said: The wine until the stopper, i.e., in the upper portion of the jug, is prohibited, but the other wine in the jug, below the stopper, is permitted.

אמר רב יימר, כתנאי: חבית שנקבה, בין מפיה, בין משוליה, ובין מצידיה, ונגע בו טבול יום ⁠— טמאה. רבי יהודה אומר: מפיה ומשוליה ⁠— טמאה, מצידיה ⁠— טהורה מכאן ומכאן.

Rav Yeimar says: Rav Pappa’s ruling is subject to a dispute between tanna’im, as the Mishnah teaches (Tevul Yom 2:7): In the case of a jug that was pierced, whether on its top, on its bottom, or on one of its sides, if one who immersed that day touched it, it is ritually impure. R' Yehuda says: If it was pierced on its top or on its bottom, it is impure. If it was pierced on one of its sides, the wine is pure, whether it was touched from here or from there, i.e., on either side. Only the wine that he touched is rendered impure. According to the first version of Rav Pappa’s statement he holds in accordance with the opinion of R' Yehuda.

אמר רב פפא: גוי אדנא וישראל אכובא ⁠— חמרא אסיר, מאי טעמא? כי קאתי ⁠— מכח גוי קאתי. ישראל אדנא וגוי אכובא ⁠— חמרא שרי, ואי מצדד צדודי ⁠— אסיר.

§ Rav Pappa says: In a case where a non-Jew is pouring the wine from the jug and a Jew is holding the beaker [kuva] into which it is poured, the wine is prohibited. What is the reason? When the wine comes out of the jug, it comes out by force of the non-Jew’s action. In a case where a Jew is pouring the wine from the jug and a non-Jew is holding the beaker into which it is poured, the wine is permitted. But if the non-Jew tilts the beaker to the side, the wine is prohibited.