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The ten days from Rosh Hashanah through Yom Kippur, during which repentance (teshuvah) is a key theme.

The ten days from through , during which is a key theme. There are additions to the prayers to this effect, including changes to the Shemoneh Esrei and adding Avinu Malkeinu. Some add Psalm 130 before Barchu or Tachanun. A common custom is to learn one of the ten chapters of Mishne Torah Hilchot Teshuva on each day.