וְאָכְל֤וּ אֹתָם֙ אֲשֶׁ֣ר כֻּפַּ֣ר בָּהֶ֔ם לְמַלֵּ֥א אֶת־יָדָ֖ם לְקַדֵּ֣שׁ אֹתָ֑ם וְזָ֥ר לֹא־יֹאכַ֖ל כִּי־קֹ֥דֶשׁ הֵֽם׃
속죄물 곧 그들을 위임하며 그들은 거룩하게 하는데 쓰는 것은 그들은 먹되 타인은 먹지 못할지니 이는 성물이 됨이며
Rashi on Exodus
ואכלו אתם AND THEY SHALL EAT THOSE THINGS i. e. Aaron and his sons because they are the “owners” of them (cf. Pesachim 59b).
Or HaChaim on Exodus
ואכלו אותם אשר כפר בהם, "and they will eat them with which atonement was made." They will eat those parts of the animal in their capacity as owners and not in their capacity as priests. The meaning of the words אשר כפר בהם is that the consumption of meat of the peace-offerings by their owners confers atonement upon them. Even Moses was forbidden to eat of any of these parts of the animal, though he was permitted to eat the breast and the thigh.
Siftei Chakhamim
Through which atonement was achieved. . . “strange” and objectionable. I.e., everything strange and objectionable that Aharon and his sons did was atoned for them through this ram of the completion-offering and this bread. [Rashi knows this] because otherwise, [if כֻפַר referred to Aharon and his sons, and not to everything “strange and objectionable”,] it should say אשר כֻפְרו בהם (plural).