Commentary for Avodah Zarah 43:4
איתיביה רבינא לרבא ישראל ועובד כוכבים שקיבלו שדה בשותפות לא יאמר ישראל לעובד כוכבים טול חלקך בשבת ואני בחול ואם התנו מתחלה מותר
Ravina raised a difficulty on Rava: If an Israelite and a non-Jew leased a field in partnership, the Israelite should not say subsequently to the non-Jew, Take your portion of the profit for the work on Shabbat, and I will take as mine for the week day.
Daf Shevui to Avodah Zarah
The baraita rules that if the field is already jointly owned by the Jew and the non-Jew, the Jew cannot let the non-Jew take the profits for the work done on Shabbat in return for the Jew taking the profit for work done on Sunday. They can only do this if they make the arrangement at the outset before they join into the partnership agreement. Evidently, Ravina thought that the saffron growers did not make their arrangement before Shabbat.
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