Commentary for Avodah Zarah 111:1
ואין בוצרין עם ישראל שעושה פירותיו בטומאה וכ"ש שאין דורכין אבל בוצרין עם העובד כוכבים בגת שמותר לגרום טומאה לחולין שבא"י:
Nor may they glean grapes together with an Israelite who works with his fruits while he is impure, and all the more so they may not tread grapes. But they may glean together with a non-Jew, since it is permitted to defile to the ordinary produce in the land of Israel.
Daf Shevui to Avodah Zarah
This is stricter than above. According to the earlier halakhah, it was forbidden to tread grapes with Jews who did not observe the rules of purity. According to the later halakhah, it was even forbidden to harvest grapes with them, for doing so was considered aiding a Jew in causing the defilement of the portion of terumah that would have to be separated from the grapes.
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Daf Shevui to Avodah Zarah
But in this matter the law became more lenient. No longer was it forbidden to cause ordinary, non-terumah, produce to become defiled. Therefore, one could glean grapes with non-Jews.
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