Note 20 — II. OUR DUTIES. (continued 2)

Tradition has handed down to us the way in which this precept is to be carried out. The four above-mentioned paragraphs are written twice on parchment, once on one piece, and once on four pieces, each piece containing one paragraph. The two sets are put into two leather cases (‏בית‎), one of which is divided into four compartments, for the four separate slips of parchment, and marked outside by the letter shin.20 Through a loop attached to each bayith a leather strap (‏רצועה‎) is passed, the two parts of which are tied together21 in such a manner as to hold the bayith on the arm or on the head. On the arm the case is placed that contains the four paragraphs written on one piece, on the head that which contains them written on four pieces. The former is called tefillah shel yad, “tefillin of the hand;” the latter tefillah shel rosh, “the tefillin of the head.”