“ A great man made the assertion; we have to find, therefore, a reason for it. There is no doubt whatever that fragments of earthenware are prohibited to be used on week days, when some other things can easily be obtained; but on Sabbath, if nothing else happens to be on hand, nor may be bought, the fragments might be considered as utensils; and, lest one might be inclined to think that for this reason they would be permitted to be used, he informs us that they are not. Can witchcraft be exercised through the agency of fragments? ”

“ The rabbis taught: For blood and all other liquids the prescribed quantity is a quarter of a lug. R. Simeon b. Elazar said the prescribed quantity for blood is as much as is used to apply to one eye; because that quantity is used when the eye is afflicted with a cataract.
All these prescribed quantities apply only to those who carry (the victuals or beverages) about. To those, however, who store them (the victuals or beverages) the carrying of even the least imaginable quantity is prohibited (because from his storing them we see that he considers them valuable) ”

“ One is of the opinion that foul breath is the result, while the other holds that the entire body assumes a bad odor. The opinion of the latter is supported by the following Boraitha: "He who takes nourishment while in need of performing his necessities is compared to a stove in which a fire was built without previously removing the ashes, which is invariably the cause of a bad smell. One who feels like performing his necessities, but cannot do so, R. Hisda advises that he keep on sitting down and getting up until able. ”