Musar su Genesi 49:28

The author tries to demonstrate at this point that the statement of our sages (Bereshit Rabbah 100,13) that Moses' blessings commenced with the words with which Jacob's blessings concluded, whereas David's blessings commenced with the words with which Moses' blessings ended indicate that David's blessings for the Jewish people were the most comprehensive.

Originally it was customary to make twelve stitches when sewing together the upper and lower parts of the housing of the phylacteries. This corresponded to the twelve tribes. Maimonides, in Hilchot Tefillin 3,10 allows for either 10 or 14 stitches. The Ari Zal noted that there were different customs in this matter. Jews from Italy, Spain, North Africa and Eastern Europe had different customs in that regard. Since there are twelve gates in the Heavens corresponding to the twelve tribes, the Ari Zal did not see any reason why these customs could not co-exist. This is all based on Ezekiel. Every tribe's prayer is perceived as ascending to Heaven via his particular gate. This does not mean that all these gates are of the same size, nor that access to them is equally easy. In view of this we understand why the various tribes have different nuances in their respective liturgy, though they all pray to the same G–d. Everybody has to retain his particular custom since nowadays we do not know who belongs to which tribe. Concerning the liturgical details found in the Talmud, these are equally valid for all the tribes, however^{Author's comment}When the Torah stresses in 49,28 that Jacob blessed each of his sons according to his particular blessing, no doubt this is meant to emphasize that despite the fact that all the sons together were extensions of Jacob, there were individual differences and that these individual differences were worth preserving..