פּירוש אויף ויקרא 6:21

ישבר [BUT AN EARTHEN VESSEL WHEREIN IT IS SODDEN] SHALL BE BROKEN — because the substance absorbed in it becomes what is known as נותר (the technical term for any portion of a sacrifice not eaten by the time prescribed for this) (cf. Avodah Zarah 76a). That, too, is the regulation applicable to all sacrifices (i. e. that an earthen vessel wherein they have been cooked must be broken).

And an earthen vessel wherein it is boiled shall be broken, etc. Rashi explains that this applies to all holy offerings. Nevertheless, the matter requires explanation as to why the Torah specifically wrote this law regarding the sin offering that comes for atonement. According to the simple interpretation, we can say that since the Torah testifies about earthenware vessels that they never release what they absorb from its surfaces (Pesachim 30b), one might have thought that this only applies to lesser holy offerings that are eaten for two days and one night, where the food remains in the pot for a long time and therefore absorbs so much that it never releases its absorption from its surfaces. But for the most holy offerings that are only eaten for one day and one night, one might have thought that in such a short time it does not absorb so much and there would be a remedy even for an earthenware vessel through rinsing. Therefore, the Torah teaches us [that this is not the case].

חרס אשר תבושל בו ישבר, “and an earthenware vessel which it has been cooked in must be broken.” This means that the boiling of the meat must also take place in the sacred precincts, just as the washing had to take place in sacred precincts.

ומרק — of the same root and meaning as the noun in (Esther 2:12) “the things for purifying (תמרוקי) women”; escourement in old French; English, scouring.