For many Jews, the High Holiday season begins with Rosh HaShanah and the start of the new month of Tishrei. Jewish tradition, however, teaches that the preceding month of Elul is a time of soul-searching and reflection to prepare oneself for the magnitude of the Days of Awe. It is during this time that we observe Selichot (also spelled s'lichot).
When you enter the land that the Eternal your God is giving you as a heritage, and you possess it and settle in it, you shall take some of every first fruit of the soil, which you harvest from the land that the Eternal your God is giving to you, put it in a basket and go to the place where the Eternal your God will choose to establish the divine name. - Deuteronomy 26:1-2
You stand this day, all of you, before the Eternal your God--you tribal heads, you elders, and you officials, all of the men of Israel, you children, you women, even the stranger within your camp, from woodchopper to water drawer… - Deuteronomy 29:9-10