The tefillin worn on the head (henceforth, “ shel rosh ”) differ in a number of respects from the tefillin worn on the arm (henceforth, “ shel yad ”). One of the differences is this: Though both must contain the four passages in the Torah which make mention of the mitzvah of tefillin, the shel yad has all four passages written on a single parchment, in the order they appear in the Torah, rolled up and placed in the single compartment of the shel yad . The shel rosh , however, is constructed such that it has four small compartments side by side. Though these compartments appear to be tightly bound to one another, in fact, they are almost actually completely separate from one another. They only join at a common base, like the fingers of one’s hand. Into each compartment is placed one of the four passages, written on four separate parchments. Here is a list of the passages, in the order they appear in the Torah: 1. Kadesh Li – Shemot 13:1-10 2. V’hayah ki Y’vi’a
The brief exchange between Avraham and Yitzchak on the way to the Akeidah , less than two verses long, and sandwiched between the two phrases “and the two of them walked together” , is the only conversation between this primal father-and-son pair recorded in the Torah. It is all the more powerful because of its brevity, because of its singleness, and because of what it doesn’t say explicitly yet, by omission, makes overwhelmingly present. When they set off for Har HaMoriah , Avraham takes only what the moment requires – he leaves behind his servants, the donkey and, presumably, any of the provisions they brought on their three-day journey, he takes the wood for the offering (placing it upon Yitzchak), the fire and the knife. That’s all there is – two men, wood, fire and knife. Thus, the set off together. Here is the conversation. Yitzchak says to Avraham, his father, he says, “my father”, and Avraham says, “Here I am son”, and he (Yitzchak) says, “here are the fire and the wood