Tashlikh
The ritual of tashlikh is performed on the afternoon of the first day of Rosh Hashanah. Prayers are recited near natural flowing water, and one's sins are symbolically cast into the water. Many also have the custom to throw bread or pebbles into the water, to symbolize the "casting off" of sins. In some communities, if the first day of Rosh Hashanah occurs on Shabbat, tashlikh is postponed until the second day. The traditional service for tashlikh is recited individually and includes the prayer "Who is like unto you, O God...And You will cast all their sins into the depths of the sea", and Biblical passages including Isaiah 11:9 ("They will not injure nor destroy in all My holy mountain, for the earth shall be as full of the knowledge of the Lord as the waters cover the sea") and Psalms 118:5-9, 121 and 130, as well as personal prayers. Though once considered a solemn individual tradition, it has become an increasingly social ceremony practiced in groups.
Read more about this topic: Rosh Hashanah