Rashi on Exodus 29:33/רש"י על שמות כ״ט:ל״ג

1ואכלו אתם AND THEY SHALL EAT THOSE THINGS i. e. Aaron and his sons because they are the “owners” of them (cf. Pesachim 59b).

2אשד כפר בהם THROUGH WHOM THERE WAS EXPIATED everything that was strange and objectionable.

3למלא את ידם TO INITIATE THEM INTO OFFICE by means of this ram and bread.

4לקדש אתם TO SANCTIFY THEM — for by means of this initiation-sacrifice they were installed and sanctified to the priesthood.

5כי קדש הם BECAUSE THEY ARE HOLY — i. e. holy in the highest degree. From this we derive the prohibition against a “stranger” (a non-priest) eating anything that is holy in the highest degree (Makkot 18b), since Scripture assigns a reason for the matter (why a stranger may not eat of these), viz., because they are holy in the highest degree (cf. Pesachim 24a).