Yosef Karo, Translation:Shulchan Aruch — Orach Chaim 583…
“ Some are careful not to eat nuts as "nut" has the same numerical value as "sin." Additionally, they cause excess saliva and phlegm and nullify prayers (Mahari"l) . We go to the river to say the verse "You shall toss to the depths of the sea all of our sins..." ”
