Midrash su Levitico 23:33

1) (Vayikra 23:33-34) "And the L–rd spoke to Moses, saying: Speak to the children of Israel, saying: On the fifteenth day of this seventh month is the festival of Succoth, seven days to the L–rd." What is the intent of this? (i.e., it is essentially stated in verse 39). Because it is written (Vayikra 23 verse 42) "In Succoth shall you sit seven days, and I do not know if the first seven days or seven other days, "On the fifteenth day of this seventh month is the festival of Succoth, seven days to the L–rd," I see that the first seven days are referred to, and not seven others.

2) "this is the festival of Succoth": This (festival) requires a succah, but the festival of matzoth (Pesach) does not require a succah. Now would it not follow a fortiori, viz.: If this (festival), which does not require matzoh, requires a succah, then the festival of matzoth, which does require matzoh, how much more so should it require a succah! It is, therefore, written "this is the festival of Succoth" — This, the festival of Succoth, requires a succah, but not the festival of matzoth.

3) "the festival of Succoth, seven days to the L–rd": I might think that the chagigah (the festival offering) and the succah should be for the L–rd; it is, therefore, written (Devarim 16:13) "The festival of Succoth should you make for yourselves seven days." If (only) the latter (were written), I would think that both the chagigah and the succah reverted to the man; it is, therefore, written "the festival of Succoth, seven days to the L–rd." How is this to be reconciled? The chagigah, to the L–rd; the succah, to the man.