What are the words "Vehaysah" and "Va'achaluhu", respectively, referring to?
Rashi and Ramban #1: "Vehaysah" refers to the Lechem ha'Panim, which are called 'Minchah', 1 which is feminine, and "Va'achaluhu", to the Lechem itself (which is masculine).
Ramban #2: "Vehaysah" refers to each of the two rows of Lechem ha'Panim.
Ramban #3 (According to Kabalah): 'And it will be for Aharon and his sons an everlasting covenant". 2
Rashi: Since anything that consists of grain is called a Minchah.
As the Pasuk states in Mal'achi, 2:5.
What are the implications of "Vehaysah le'Aharon u'le'Vanav"?
Yoma, 17b: It implies 'half for Aharon and half for his sons'. 1
How can Aharon on his own eat six Chalos - twelve Isronim - in one day considering that the average daily consumption per person is one Isaron?
Oznayim la'Torah (in Vayikra, 2:3): The fact Kohen Gadol takes six loaves is in deference to his status; but he did not actually eat them all; he shared them with his relatives and friends.
Why does the Torah switch from "Vehaysah" (feminine) to "Kodesh Kodshim Hu" (Masculine)
Sifra: It switches from the Minchah to the Lechem to teach us that each loaf must be complete, that if one of them is broken, they are all Pasul.
Having begun with "le'Aharon u'le'Vanav", why does the Torah write "Kodesh Kodshim hu Lo (singular)?
Sifra: To teach us that after Aharon chooses whichever six loaves, the remaining six loaves arre distributed among his sons. 1
See Torah Temimah, note 23.
What is "Chok Olam" coming to teach us?
Menachos, 27a: It teaches us that both of the two rows and both of the two bowls are crucial (that one without the other is Pasul) and that the two rows and the two bowls are crucial to one another (that one without the other is Pasul). 1
See Torah Temimah, note 24. The Gemara in Menachos learns via a Gezeirah Shavah "Chok Olam" "Chok Olam" that the twelve Chalos of the Chavitei Kohen too, are crucial.