Rashi, a prominent Jewish commentator, bases the number of knots on a gematria: the word "tzitzit" (in its Mishnaic spelling, ציצית) has the value 600. Each tassel has eight threads (when doubled over) and five sets of knots, totaling 13. The sum of all numbers is 613, traditionally the number of commandments in the Torah. This reflects the concept that donning a garment with "tzitzyot" reminds its wearer of all Torah commandments, as specified in Numbers 15:39. (Rashi knots are worn by the majority of Ashkenazic Eastern European Jews.)