Yom Kippur ends ten days of repentance with a twenty-five-hour fast and five prayer services, and one rule governs the whole: sins between a person and God are atoned by the day, but sins between a person and another person are not — you must go to the person. The tradition sets the days before Yom Kippur aside for exactly that, and treats a refused apology carefully (ask three times, before witnesses, and the obligation transfers to the one refusing). The liturgy is communal and first-person plural throughout: we have sinned, even if you personally did not.