Related for Avodah Zarah 59:14

שמואל לא שתי מיא מבי ארמלתא אמר לית לה אימתא דגברא ולא מיכסיא מיא אבל מבי ארמאה שתי נהי דאגילויא לא קפדי אמנקרותא מיהא קפדי א"ד רב לא שתי מיא מבי ארמאה אבל מבי ארמלתא שתי שמואל לא שתי מיא לא מבי ארמאה ולא מבי ארמלתא:

Shmuel [on the other hand] would not drink water from the house of a widow. He said: The fear of her husband is not on her and she will not necessarily keep the water covered. But he would drink from the house of a non-Jew. Even if they are not particular about [the prohibition relating to] uncovered liquids, they are particular about cleanliness. Some say that Rav would not drink the water from a non-Jew’s house, but would drink that of a widow's house, while Shmuel would not drink the water from either the house of a non-Jew or that of a widow.

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