Related for Avodah Zarah 4:8

לוֹקְחִין גַּת בְּעוּטָה מִן הַגּוֹי אַף עַל פִּי שֶׁהוּא נוֹטֵל בְּיָדוֹ וְנוֹתֵן לַתַּפּוּחַ. וְאֵינוֹ נַעֲשֶׂה יֵין נֶסֶךְ, עַד שֶׁיֵּרֵד לַבּוֹר. יָרַד לַבּוֹר, מַה שֶּׁבַּבּוֹר אָסוּר, וְהַשְּׁאָר מֻתָּר:

It is permitted to buy a trodden winepress from a gentile, [who trod upon the grapes], even though he (the gentile) takes in his hand [grapes from the wine] and places it on the tapuach [the place (shaped like a mound) where the grapes are gathered. Our tanna holds that it does not become forbidden wine (yayin nesech) until it descends to the cistern. (This is an earlier Mishnah and is not the halachah, but once the wine starts running down it is yayin nesech)]. It is not yayin nesech until it descends to the cistern. Once it descends to the cistern [— then, if a gentile touches it], what is in the cistern is forbidden and the rest is permitted.

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