He who says, “I will sin and repent; I will sin and repent,” they do not assist him in achieving repentance.  [If he says] “I will sin and Yom Kippur will provide atonement,” Yom Kippur does not provide atonement.  For sins between man and God, Yom Kippur provides atonement; but for sins between man and his fellow man, Yom Kippur does not provide atonement, until he appeases his fellow man.  This did R' Elazar ben Azariah expound: From all of your sins before God shall you be cleansed —- [from this we derive] for sins between man and God, Yom Kippur provides atonement; but for sins between man and his fellow man, Yom Kippur does not provide atonement, until he appeases his fellow man.  R' Akiva said: Praiseworthy are you, O Israel! Before Whom do you cleanse yourselves? Who cleanses you? Your Father in Heaven! As it is said: And I will sprinkle pure water upon you and you shall be cleansed; and He also says: The mikveh of Israel is Hashem. Just as a mikveh purifies the contaminated, so does the Holy One, Blessed is He, purify Israel.

A succah that is more than twenty cubits high is invalid. R’ Yehudah validates it.  And [a succah] that is not ten handbreadths high, or [one] that does not have three walls, or [one] whose sun[ny area] is greater than its shade[d area], is invalid.  An old succah —- Beis Shammai invalidate it and Beis Hillel validate it. And what is [considered] an “old” succah? Whatever one built thirty days prior to the Festival. But if one built it specifically for the Festival, even [if he put it up] at the beginning of the year, it is valid.

If one builds his succah under a tree, it is as though he had built it inside the house.  If a succah [is built] atop another succah the upper one is valid, and the lower one is invalid. R’ Yehudah says: If there can be no tenancy in the upper one, [only] the lower one is valid.

If one spread a sheet over [the s’chach] because of the sun, or beneath it because of the falling leaves, or if one spread it over a four-poster bed, it is invalid. However, one may spread it over a two-poster bed.