Menahot, Chapter Two, Mishnah Four
This mishnah contains another example of the same rule found in yesterdays mishnah.
1) The animal-offering can render the libations piggul after they have been sanctified in the vessel, the words of Rabbi Meir.
2) But the libations cannot render the animal-offering piggul.
a) Thus, if he slaughtered an animal-offering intending to eat part of it on the next day, both it and the libations are piggul; if he intended to offer the libations the next day, the libations are piggul but the animal-offering is not.
Section one: When one offers an animal sacrifice, he must bring with it libations. This includes a minhah and a wine-libation (see Numbers 15). Rabbi Meir holds that if the priest has a disqualifying intention with regard to the animal offering, the libations become piggul as well, as long as they have already been sanctified by being put into a ministering vessel.
The sages opinion with regard to this issue is not found in this mishnah. In Zevahim 4:3 we learn that the sages hold that the libations that accompany an animal offering cannot ever become piggul. Therefore, even if the priest has a disqualifying intention with regard to the animal, the libations can still be eaten.
Section two: Since the libations are ancillary to the animal-offering, even if the priest has a disqualifying intention with regard to them, the animal-offering is not piggul.