Commentary for Avodah Zarah 74:15
והשלקות: מנהני מילי א"ר חייא בר אבא אמר רבי יוחנן אמר קרא (דברים ב, כח) אוכל בכסף תשבירני ואכלתי ומים בכסף תתן לי ושתיתי כמים מה מים שלא נשתנו אף אוכל שלא נשתנה
Cooked food. From where is this derived?R . Hiyya b. Abba said in the name of R. Yohanan: Scripture says, “You shall sell me food for money that I may eat, and give me water for money that I may drink” (Deuteronomy 2:28). [The food] must be like water, just as the water has undergone no change so too the food must have undergone no change.
Daf Shevui to Avodah Zarah
During their wandering in the wilderness Moses approaches Sihon, King of Heshbon, and asks him for food and water. The rabbis compare the food and the water—just as the water the Israelites will drink has not been modified at all, so too the food that they buy from them must not be modified at all.
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