Chazal teach us that the Luz bone is at the top of the next, where the skull rests.
According to Cabalistic Tradition the Luz bone does not deteriorate in the grave along with the rest of the body. It will from the nucleus from which the rest of our bodies will be reconstrued when the dead are resurrected during the messianic era.
According to the Mishnah Brurah (300:2) this bone get its nourishment from the Melave Malka meal.
According to the Kaballah, the Name of the letter Lamed means to teach.
The name of the letter Zayin can either mean a weapon of war or nourishment.
The name of the letter Vav means hook.
What's the connection behind all these ideas?
Megillah 17b: Joseph cried as he foresaw the destruction of the Temple.
More Melave Malka Pearls of Halacha and Hashkaffa:
Creating the Right Atmosphere
Rav Yaakov Emden stresses that the Gemara puts the stress on setting your table and creating the proper atmosphere.
The Mishnah Brurah suggests lighting extra candles for the meal.
The Beit Yosef, suggests singing songs at the Melave Malka.
Many refer to melee malka as the meal of Dovid Hamelech.
The Chassidic Masters suggest doing Melave Malka with friends and telling stories about the Baal Shem Tov.
While ideally Melave Malka should be had on bread, bdieved in order to avoid Achilat Gasah, it can be had on Mezonot, fruits (and some even allow a hot drink like tea.
If the 3rd meal went late, the Eliahu Rabbah allows this to count as the Melave Malka, as long as one intended it to count as this.
Why do we do Melava Malka?
Rav Shimshon Pinkus asks (in Shabbos Kodesh): Shouldn't we be sad when Shabbos leaves? Why are we celebrating?
We are strengthening our faith that all of our blessings flow from our Shabbos observance.