אייתו להו פורייתא, לרב חנן בר רבא לא אייתו ליה. אשכחיה מתני ליה לבריה: ועל צואה של קטן מפני קטן. אמר ליה: אבין שטיא מתני שטותא לבניה, והלא היא עצמה מוכנת לכלבים! וכי תימא דלא חזיא ליה מאתמול — והתניא: נהרות המושכין ומעיינות הנובעין — הרי הן כרגלי כל אדם.
they brought beds for them to sit on, whereas for Rav Ḥanan bar Rava, they did not bring one for him. Rav Ḥanan was insulted and got angry at his host. He found R' Avin teaching his son the Mishnah and saying: And one may place a bowl on top of the feces of a child due to the child so that he will not touch it and dirty himself. Rav Ḥanan said to him: Avin the fool is teaching his son folly; aren’t the feces themselves prepared as food for dogs? An object that is fit for consumption by a dog may be carried, so why need one cover the feces if he can remove them? And if you say these feces were not prepared for that use from yesterday, that would not prohibit moving them. Wasn’t it taught in a baraita: With regard to rivers that flow and springs that gush, they do not have specific Shabbat boundaries, but they may be used anywhere and their boundaries are like the feet of all people who draw from them. Even though the water was not within the boundaries when Shabbat began, since the nature of flowing water is to move from place to place, it is as if they were prepared for this purpose. So too, here, since a child will relieve himself in any place, it is as if it was prepared from before Shabbat.