Why must the earthenware vessel that absorbs taste of a Chatas require breaking?
Rashi: Because what it absorbs becomes Nosar. 1
Following the night after Shechitah (See Sifsei Chachamim).
What is the definition of "Morak v'Shutaf ba'Mayim"?
Rashi: It means that the copper vessel must be purged - in boiling water and rinsed in cold water.
Why can one not also purge an earthenware vessel?
Rashi: The Torah is teaching us here that earthenware vessels never completely exude what they absorb.
Whereabouts are earthenware vessels broken and metal ones purged?
Ramban: In the Azarah. 1
Since this whole Pasuk refers to "be'Makom Kadosh" in the previous Pasuk (Ramban).
What happened to all the broken pieces of earthenware?
Ramban: They sunk miraculously into the ground.
Rashi writes that a Kli Cheres that absorbs taste of a Chatas must be broken, for the taste is Nosar. [After 24 hours], the taste is detrimental. It should not forbid!
Moshav Zekenim, R. Chaim Paltiel: "L'Mashchah" is written about Kodshim, i.e. grandeur, the way kings eat, without any detrimental taste. 1
It seems that this is the intent of Riva citing R. Tam. (PF) Divrei Yatziv (CM 105:7) - Kometz l'Minchah says that one may not use it to cook Chulin, for it is a Kli Shares.
Rashi writes that a Kli Cheres must be broken because it absorbs taste. In Zevachim (95b) the Gemara asked [and did not resolve] whether one must break an oven if Chatas was baked in the airspace, even without absorptions!
R. Akiva Eiger (95b): Rashi derived from the Sugya that the question was settled; only absorptions obligate breaking or Merikah and Shetifah.