Parashas Masei · Passuk 33:38 · TT note 1
Chabad.org — English translation + Rashi
Torah Temimah points to Bava Basra 17a (TT note on “עַל פִּי ה׳”).
E-Daf.com — Tsurras Hadaf (Bava Basra 17a)
HebrewBooks / Shas PDF of the daf
English: The Sages taught: Six over whom the Angel of Death had no sway — among them Moses, Aaron, and Miriam, as it is written of them “by the mouth of the Lord.” And seven over whom the worm and the maggot had no sway — among them Moses, Aaron, and Miriam, as it is written “by the mouth of the Lord.”
Custom — midrashic force of “al pi Hashem” as death by the divine kiss, not by the Angel of Death.
Aaron’s death “by the mouth of the Lord” places him among the few over whom neither the Angel of Death nor decay held sway — a death of intimacy, not of force.