Parashas Acharei Mos · Passuk 16:01
Chabad.org — English translation + Rashi
Torah Temima points to Toras Kohanim / classical source on kapparah of the righteous.
English: Why mention their death with Yom Kippur? To teach that just as Yom Kippur atones for Israel, so the death of the righteous atones for Israel.
Death of the righteous as kapparah
The Torah links the death of Aharon’s sons to the Yom Kippur service to teach that the death of the righteous effects kapparah for Israel.