Musar su Genesi 50:26

The Zohar writes at the end of פרשת וזאת הברכה: "We have learned that Jacob, Moses, and Joseph pursued a similar path. Jacob died and was buried in ארץ ישראל, both flesh and bones. Joseph had only his bones buried in ארץ ישראל. Moses had neither his flesh nor his bones buried in ארץ ישראל. What is the reason for this? Jacob was the original "husband" of the שכינה called "Matronita." [We have explained how Jacob's name was engraved on the throne of G–d. The throne is a form of the "upper" שכינ ה also identified with the emanation בינה, which is perceived of as female. The "lower" שכינה is the emanation מלכות. In either case, both at the beginning of his career and at its end, Jacob is perceived as the "husband" of that level of the שכינה. Ed.]

If a person is drawn after bodily pleasure and the passions of his mind, to the neglect of his Creator’s service, he allows himself to be caught in an evil trap. For in consequence, he will not merit proper burial in a coffin. See the Zohar (2:214b) which elaborates on the principle exemplified by the righteous Yosef, who guarded his covenant [of circumcision] and merited that it be stated of him, “he was placed in a coffin in Egypt” (Bereishis 50:26). One who follows his appetites and heartstrings, by contrast, will inevitably stumble in the sin of wasting seed. Therefore, let whoever fears and trembles at the word of Hashem heed this worthwhile piece of advice. Let him view eating or even tasting before praying as equivalent to consuming non-kosher food. And let him pray with weeping and supplication that Hashem enable him to be satisfied with a minimal amount of food and drink so that he will not need to engage in profuse eating and drinking.