Parashas Acharei Mos · Passuk 16:30
Chabad.org — English translation + Rashi
Torah Temima points to Yoma (kapparah of the day itself).
English: “For on this day He shall atone” — on this day itself, even when there are no korbanot and no goat, Yom Kippur effects kapparah.
Kapparah of the day independent of the avodah
The day of Yom Kippur itself carries atoning power even in the absence of the Temple service.