“ According to biblical law, an opening through which one cannot enter or go out is not considered a door, but the rabbis made this a precaution on account of chicken-coops, [the holes of which] are made for the purpose of admitting fresh air and emitting the foul. (Therefore making a hole in a coop is equivalent to making a whole coop, for without holes it is of no value.) ”

“ A man may break open a cask, to eat dry figs therefrom; provided, he does not intend using the cask afterwards as a vessel. He must not pierce the bunghole of a cask, such is the decree of R. Jehudah (or R. Jose) ”

“ Said R. Oshea: "This [that a man may hold a dirk to open a cask of figs] was only learnt when [the figs] are very tightly packed [for then he would have to use a knife or a dirk to get the figs out] ; but if they were packed loose he must not [use a knife to open the cask] ."
And if they were packed loose he must not [use a knife to open the cask] ? An objection was raised: [We have learned:] R. Simeon ben Gamaliel said: "A man may bring in the cask of wine, and cut off its bung-head with a knife, and serve it to the guests on Sabbath with impunity." ”