2,410. "Make Wine for Me"

Maachalos Assuros 13:3

Let’s say that a non-Jew hires a Jew to make him wine in a state of ritual purity so that it will be permitted to Jews and they’ll buy it from him, and the wine is in a building owned by the non-Jew. If the Jew watching the wine lives in that courtyard, it remains permitted even if the entrance is open and the watchman comes and goes. If the watchman lives elsewhere, the wine is prohibited even if the key and the seal are with a Jew. This is because the wine belongs to the non-Jew and it’s on his property, so he wouldn’t hesitate to enter the building. He’ll think, “What’s the worst that could happen? If they find out, okay; so Jews won’t buy it.”

Maachalos Assuros 13:4

Even if a non-Jew wrote the Jew a receipt saying that he received money to sell him the wine, since the Jew can’t remove the wine from the non-Jew’s property until he actually pays, the wine still belongs to the non-Jew and is prohibited unless the watchman lives in that courtyard. The guard doesn’t have to sit there and guard the wine around the clock. Rather, he can come and go as has already been discussed, both when the wine is on the owner’s property and when it on another non-Jew’s property.