Halakhah su Levitico 23:42

It is written "For seven days teishvu in sukkos," (Leviticus 23:42), which means "you must dwell" in sukkos. The Torah teaches that you should make the sukkah your home for seven days. Just as you live in your home all year, so now [on Sukkos] the sukkah should be your principal residence. There you should bring your fine china and elegant tablecloths. You should eat, drink, study,¹You must study Torah in the sukkah only if you are able to concentrate with total peace of mind. However, when because of cold weather you are unable to remain there for an extended period, to study with concentration, you are exempt, and may study in your home or in the Beis Midrash. (Mishnah Berurah 639:29) spend your leisure, and sleep in the sukkah. Even conversation with friends²However, because of the sacred nature of the sukkah, you must be very careful not to speak about forbidden subjects, gossip or slander. (Ibid 639:2) should be held in the sukkah, and if you pray alone³If however there is a synagogue in your area, you must leave the sukkah and attend the synagogue because during the rest of the year, you also leave your house to pray in the synagogue. (Ibid 639:30) you should also pray in the sukkah. It is written, "This is so that future generations will know that I caused the Israelites to live in sukkos when I brought them out of Egypt," (Leviticus 23:43). Therefore, you should keep in mind when you live in the sukkah, that the Holy One, blessed is He, commanded us to live in the sukkah as a memorial of the Exodus from Egypt. Regarding the sukkos of which the verse says "That I caused [the Israelites] to live in sukkos, there is disagreement among Taanaim. Rabbi Eliezer says that it refers to the Clouds of Glory with which the Holy One, blessed is He, surrounded our forefathers, to shield them from the heat and the sun. Rabbi Akiva, says that it means actual sukkos that they built for themselves when they camped [in the desert] as a protection from the sun. Although we departed from Egypt in the month of Nisan, He did not command us to build the sukkah during that season, because it is the beginning of the summer, when people usually build booths for the shade, and it would not be recognized as being built in order to fulfill the mitzvah of the Creator, blessed is His Name. He, therefore, commanded us to make it in the seventh month, which is the rainy season, when people usually move out of their booths to live in their homes; but we move out of our houses to live in the sukkah; which makes it clear to all that we are fulfilling the King's command.

The commandment of sitting in a sukkah (booth): The commandment of a sukkah, since we were commanded to sit in a sukkah for seven days - as it is stated (Leviticus 23:42), "In huts shall you sit for seven days." The first day [of these seven] is the fifteenth day of Tishrei.

It is a positive biblical commandment to sit in the Sukkah for seven days, from the 15th of Tishrei until after the 21st of Tishrei, for it is written in Parashat Emor (Leviticus 23:34): "On the fifteenth day of this seventh month is the feast of tabernacles for seven days unto the LORD... Ye shall dwell in booths seven days; all that are home-born in Israel shall dwell in booths; that your generations may know that I made the children of Israel to dwell in booths, when I brought them out of the land of Egypt" (Leviticus 23:42-43).