Tashlich – the “casting out” of our sins by throwing bread crumbs into flowing water on the first day of Rosh Hashana – This very ancient custom comes from the Bible – Micha 7:19 -
It goes back many centuries but the early writings about it is from the 14th century in Germany - many rabbis tried to do away with the tradition but it is still popular today and very symbolic.
Watch this short YouTube video to learn more about this tradition:

