The word ‘כַד-jug,’ a vessel for containing drawn water, has the numerical value (gematria) of 24. This represents the 24 Books of the Tanach (Torah, Neviim, Kesuvim). The Torah is a “vessel” for Hashem’s Infinite Light that is drawn into it. The shoulder is the part of the body closest to the head. By saying that the ‘כַד-jug’ was on the ‘shoulder,’ this represents the way that Torah exists ‘next to the Head,’ meaning close to its source in Hashem, on an exalted spiritual level. The goal is that this ‘כַד-jug’ of Torah knowledge should come down from the ‘shoulder’ and ‘Head’ and be poured down until it reaches our physical world.
This process of enabling the Torah to reach our physical world was connected to Yaakov receiving the blessings of Infinite Light higher than the Order of Worlds, which are so powerful that they bring the Light all the way down to the physical world.
