Exodus 29:33

ואכלו אתם AND THEY SHALL EAT THOSE THINGS i. e. Aaron and his sons because they are the “owners” of them (cf. Pesachim 59b). אשד כפר בהם THROUGH WHOM THERE WAS EXPIATED everything that was strange and objectionable. למלא את ידם TO INITIATE THEM INTO OFFICE by means of this ram and bread. לקדש אתם TO SANCTIFY THEM — for by means of this initiation-sacrifice they were installed and sanctified to the priesthood. כי 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).

וְאָכְל֤וּ אֹתָם֙ אֲשֶׁ֣ר כֻּפַּ֣ר בָּהֶ֔ם לְמַלֵּ֥א אֶת־יָדָ֖ם לְקַדֵּ֣שׁ אֹתָ֑ם וְזָ֥ר לֹא־יֹאכַ֖ל כִּי־קֹ֥דֶשׁ הֵֽם׃

And they shall eat those things with which atonement was made to consecrate and to sanctify them: but a stranger shall not eat of them, because they are holy.