TWO AND TWO = T’FILLIN
The Mitzvah of wearing T’fillin is mentioned in the Torah four times; twice in the book of Exodus and twice in Deuteronomy. These four sections are written out and contained in the T’fillin. In the Hand T’fillin they are all written on one scroll, whereas in the Head T’fillin they are written on four separate scrolls and inserted into four separate compartments.