Avodah Zarah

Come and hear: IF HE POURED FROM [HIS OWN] VESSEL INTO [A HEATHEN'S] VESSEL, [THE WINE IN THE VESSEL] FROM WHICH HE POURED IS PERMITTED. Hence what is between [the two vessels] is prohibited; so deduce from this that the outflow is a connecting link! But if the outflow is a connecting link, then what is inside [the first] vessel should likewise be prohibited! — This is no difficulty, because [we have here a case where] he cuts off [the outflow].  Nevertheless [we do deduce from this that]  the outflow is a connecting link! But according to your reasoning I will quote the continuation: AND [THE WINE IN THE VESSEL] INTO WHICH HE POURED IS PROHIBITED. Hence what is between [the two vessels] is permitted! Consequently no inference is to be drawn from this Mishnah. Come and hear: If he pours from a cask into a vat [which contains yen nesek], the jet of liquid which descends from the rim of the cask is prohibited!  — R. Shesheth explained this [extract] as referring to a heathen pouring out so that [the wine flows] because of his action.  But if it is a heathen pouring out, what is in the cask is likewise prohibited!  — [What is disqualified] because of a heathen's action is prohibited by the Rabbis,  and they decreed only against what issued [from the cask] and not against what was inside it. R. Hisda told the [Israelite] wine-dealers: When you measure wine for heathens, either cut off [the outflow] or pour it in with a splash.  Raba told the [Israelites] whose occupation was to pour wine: When you pour wine, let no heathen come near to help you, lest you forget yourselves and rest [the vessel] upon his [hands] and [the pouring] result from his action and [the wine] be prohibited. A man was drawing wine  through [a siphon consisting of] a large and small tube. A heathen came and laid his hand upon the large tube,  and Raba disqualified all the wine.  R. Papa said to Raba — another version is, R. Adda b. Mattena said to Raba; and still another version is, Rabina said to Raba: Was it on account of the outflow? So is it to be deduced from this that the outflow is a connecting link? — [Raba answered: No;] it is different in this instance, because all the wine is drawn through the siphon. Mar Zutra son of R. Nahman said: It is permitted [to drink from] a vessel containing several tubes,  provided the Israelite stops first but not when a heathen stopped first.  Rabbah son of R. Huna visited the house of the exilarch and allowed [the company which included Gentiles] to drink from a vessel containing several tubes.