Menachot 15: Exclusivity of Rendering Piggul; Cannibus

Daf 14 ended with the following Mishna: Rabbi Yehuda teaches that if one of the two shewbread arrangements or if one of the two loaves of Shevuot became ritually impure, it s disqualified. If either is imperfect in its equality than all are disqualified.  The rabbis say that the impure one stays in its state of impurity and the pure one may - and should - be eaten.

Daf 15 continues the discussion on that Mishna.  Most of that conversation focuses on what renders a sacrifice piggul, one offered with improper intentions.  A new Mishna is introduced.  It teaches that Loaves offered with a thanks offering are piggul but the thanks offering itself is not piggul.  This is because of one slaughtered the thanks offering, which must be eaten during the day, with the intention to eat the loaves the following day, only the loaves are piggul.  

Similarly, if the lambs sacrificed with two loaves/meal offering on Shavout render the accompanying loaves piggul, the loaves do not render the lambs piggul.  This is because the lambs must be consumed during the day and they are slaughtered that day and in the night with the intention of consuming them the following day - and if this was done with the intent to eat the loaves the following day, the loaves are piggul while the lambs are not piggul.

It is notable that one of the rabbis' conversations turns to crops that might become disqualified because of kilayim, forbidden mixtures.  We learn that a field growing cannabis or luf, arum, cannot also grow other types of plants because cannabis and luf yield only once every three years.  Rashi says that because of their long lives they are thought to be significant and cannot be planted with grapevines.  The Keseff Mishna says that the Rambam says they are forbidden because grapevines also last for three years.  The Ramban says that they might become intertwined with other vines.  As well, the Raavan says that they should not be planted together because they are cultivated, which means that they are planted with the intention of keeping them.

Steinsaltz explains that cannabis was used to create fibres for weaving, to produce oil for industrial use, and to create hashish for medical purposes.  Luf, on the other hand, is more dangerous as a drug as it causes pain and rash to one who touches it.  Humans can consume it once it has been cooked or roasted, however.