See note on Leviticus 6:11.
|If its blood...|
(See Yad, Maaseh HaKorbanoth 8:1).
|must be broken|
The taste is absorbed in the pot (see Leviticus 6:11), and after the prescribed time, it becomes forbidden as food (Rashi; Yad, Maaseh HaKorbanoth 8:11). It is from here that we learn that a clay pot absorbs the taste of food and it cannot be purged (Rashi; Zevachim 95b). See Leviticus 11:33, 15:12.
In boiling water, to remove the taste of the offering (Zevachim 96b; Yad, Maaseh HaKorbanoth 8:12; Rashi). It is from here that we learn that pots contaminated with non-kosher food can be purged in boiling water. Also see Numbers 31:23.