A customary Jewish atonement ritual performed in Rosh Hashanah, the Jewish new year, or sometimes later on during the High Holidays. The word Tashlikh denotes an act of “casting off”, and in modern Hebrew could also deviate to “projection”, but the name "Tashlikh" and the practice itself are derived from an allusion mentioned in the Biblical passage (Micah 7:18–20) recited at the ceremony: "You will cast all their sins into the depths of the sea."
The ritual is performed facing a large, natural body of flowing water (as a river, lake, sea, or ocean), wherein the penitent recites the passage from Micah followed by Psalm 33 and other optional prayers. During the Tashlikhprayer, the worshipers symbolically throw their sins into thesource of water by waving the sides of their jackets, or any other apparel.
-Amit Ben-Ami