TT #49 · Parshas Shemini · Aliyah 3 · Passuk 6
Chabad.org — Vayikra Chapter 10 with Rashi
English: “Do not tear your garments”: the special command to Aaron’s sons implies that everyone else is obligated to tear garments in mourning.
Moed Katan 15a.
E-Daf.com — Moed Katan 15a (Tsurras Hadaf)
Textual inference — the special prohibition against tearing the garments of Aaron’s sons implies the general obligation of mourning through tearing.
The prohibition on tearing the priestly garments establishes by inference the obligation of ordinary mourners to rend their garments.