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MB3 158b: Food Trapped, Picked or Brought from Outside the Techum on Shabbos (325:7-8)
If there is a doubt whether the food was brought from outside the techum the food is prohibited until after Shabbos is over (ספק מוכן אסור). Do you have to wait כדי שיעשו?
If a non-Jew brought water from outside the techum on Shabbos.