SOURCE: Bernstein, Jüdische Sprichwörter und Redensarten. Yom Kippur, the holiest and most solemn day in the Jewish calendar, is dedicated to atonement and repentance.
See another saying about Yom Kippur
ערבֿ–יום–כּיפּור ווערן אַלע גנבֿים פֿרום.
Erev-yomkiper vern ale ganovim frum.
On the eve of Yom Kippur all thieves become pious.
