1)
Why does the Torah add the word "Chag ha'Sukos ... la'Hashem"?
1.
Rashi (in Sukah 9a) and Targum Yonasan: To teach us that one should celebrate Sukos for the sake of the Mitzvah 1
2.
Targum Onkelos: 'Celebrate the Yom-Tov of Sukos ... before Hashem'.
3.
Sukah, 9b: To teach us that, just as the Name of Hashem (Kedushah) takes effect on the Korban Chagigah, so too, does it take effect on the Sukah - and the wood of the Skah is therefore Asur be'Hana'ah throughout the seven days of Sukos. 2
