And so shall [the high priest] do for the Tent of Meeting, which
dwells amongst them in the midst of their defilement (Leviticus 16:16)
Also when the people of Israel are in a state of defilement, the Divine
Presence dwells with them.
(Talmud)
For on this day, He shall atone for you (16:30)
On Yom Kippur, the day itself atones... as it is written, "For on this day...
shall atone for you."
(Maimonides)