And one may not harvest grapes together with a Jew who produces wine from his fruit in a state of ritual impurity, as he is thereby causing the produce to be rendered impure. And all the more so may one not tread on the grapes with him, as he is assisting the Jew who is rendering the wine impure by treading on the grapes. But one may harvest grapes into the winepress together with the gentile, as it is permitted to impart impurity to non-sacred produce that is in Eretz Yisrael.

§ The mishna teaches: And the gentile’s touch does not render the juice of the grapes into wine used for a libation until it descends into the collection vat, because until then it does not have the status of wine. The Gemara asks: But isn’t it taught in a mishna (Ma’asrot 1:7) with regard to the stage when the work of producing the wine is considered complete and one is obligated to separate tithes from the wine: With regard to wine, one is obligated to separate tithes from the time that the solid residue floats [misheyikpe] on top of the wine.

Rava said: It is not difficult. That mishna is in accordance with the opinion of Rabbi Akiva, whereas this mishna is in accordance with the opinion of the Rabbis. This is as we learned in a baraita: With regard to wine, one is obligated to separate tithes from the time that the wine descends into the collection vat. Rabbi Akiva says: One is obligated to separate tithes only from the time that the solid residue floats on top of the wine.

A dilemma was raised before the Sages: Is Rabbi Akiva referring to the floating of the seeds on top of the wine in the collection vat or to the floating of the yeast on top of the wine in the barrel?

The Gemara suggests: Come and hear a resolution of this issue, as it is taught in that mishna: With regard to wine, one is obligated to separate tithes from the time that the solid residue floats on top of the wine. Subsequently, even though the residue has floated, one may collect wine from the upper winepress and from the pipe that connects the upper winepress to the vat, and one may drink it without separating tithes. Conclude from the mishna that we are speaking about the floating of the seeds on top of the wine in the collection vat. The Gemara affirms: Conclude from it that it is so.

The Gemara asks: But didn’t Rav Zevid teach a different version of the aforementioned dispute in a baraita of the school of Rabbi Oshaya: With regard to wine, one is obligated to separate tithes from the time that the wine descends into the collection vat and the seeds float on top. Rabbi Akiva says: One is obligated to separate tithes only from the time that one siphons the wine from the vat into barrels. The Gemara replies that one can resolve the contradiction: Explain that first baraita in this manner as well: With regard to wine, one is obligated to separate tithes from the time that the wine descends into the collection vat and the seeds float on top. Rabbi Akiva says: One is obligated to separate tithes only from the time that one siphons the wine from the vat into barrels.

The Gemara asks: But whose opinion is expressed in the mishna that teaches: The gentile does not render the juice of the grapes into wine used for a libation until it descends into the collection vat? Shall we say that the stage when the work of producing the wine is considered complete is subject to a dispute between three tanna’im? The Gemara replies: No, the prohibition of wine used for a libation is different, as the Sages were stringent concerning it and render the wine forbidden even before the seeds float. By contrast, with regard to tithes, the tanna of this mishna holds in accordance with the opinion of either Rabbi Akiva or the Rabbis.