In Judaism, the Ten Days of Repentance (עֲשֶׂרֶת יְמֵי תְּשׁוּבָה, ʿǍseret yəmēy təšūvā) are the first ten days of the Hebrew month of Tishrei, beginning with the Jewish New Year Rosh Hashanah and ending with the conclusion of Yom Kippur. These days usually fall in September and/or early October.
Due to the proximity to Rosh Hashana and Yom Kippur, in this period Jews focus on repenting for their sins and seeking out closeness with God.
The term "Ten Days of Repentance" appears in such early sources as the Jerusalem Talmud, the Pesikta Rabbati, and the writings of the Geonim, and has been the predominant title since the period of the Rishonim. The Babylonian Talmud uses a different expression - "the ten days between Rosh HaShanah and Yom HaKippurim" - while among Geonim we also find "the ten days from the beginning of Tishrei to Yom HaKippurim," "the first ten days of the month of Tishrei," and "(the time) between Rosh HaShanah and Yom HaKippurim."
Repentance in Judaism
During this time it is considered appropriate for Jews to practice repentance (Hebrew: teshuvah, literally: "returning"), meaning examining one's ways, engaging in repentance and improving one's ways in anticipation of Yom Kippur. This repentance may be expressed as early morning penitentiary prayers (known as selichot), giving of charity, acts of kindness, self-reflection, or extra zehirut (spiritual vigilance).
The period is described as a special one in the Talmud:
"Seek Hashem when He is to be found" () - these are the days between Rosh Hashanah and Yom Kippur.
Maimonides provides a fuller description:
Despite the fact that "Teshuvah" and crying out to HaShem are always timely, during the Ten Days between Rosh HaShanah and Yom HaKippurim they are exceedingly appropriate, and are accepted immediately, as it says, "Seek Hashem when He is to be found".
Every person should view himself all year as if he were half innocent and half guilty. And that is the way he should look at the world as well, as if it were half innocent and half guilty.