
Tashlikh (תשליך, meaning `casting off`) is a long-standing Jewish practice usually performed on the afternoon of Rosh Hashanah, the Jewish New Year, however it can be said up until Hoshana Rabbah. The previous year`s sins are symbolically `cast off` by reciting a section from Micah that makes allusions to the symbolic casting off of sins...
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http://en.wikipedia.org/wiki/Tashlikh

Literally casting off. A custom of going to a river and symbolically casting off one's sins. See Rosh Hashanah.
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https://www.encyclo.co.uk/local/23059
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