Comentario sobre Levítico 5:12

חטאת הוא IT IS A SIN-OFFERING — Here, too, the apparently redundant words intimate: if the קמץ has been taken from it and has been burnt for the purpose of (i.e. having in mind that it is) a sin-offering it is valid; if, however, this was done not for its purpose (i. e. the priest had another offering in mind when officiating) it is invalid (Sifra, Vayikra Dibbura d'Chovah, Chapter 19 9).

Not for its sake. Meaning: For example: He brought it at first for the sake of a pan-baked meal-offering and then at the time of taking a fistful he took it for the sake of a deep-pan meal offering, or vice versa. Rashi repeats this here [see v. 9] because this is a meal-offering and those above refer to an animal or bird, and [one cannot be learnt from the other because] they have dissimilar aspects.