People who pay attention to what they read realize, as I describe in detail in my book “Mysteries of Judaism,” that none of the Jewish holidays are practiced today as the Torah mandates. The rabbis made extensive changes in Torah laws because of changes in human circumstances. What do we know about Sukkot? The following is the unusual answer by the sage Arnold B. Ehrlich (1848-1919).
The fall holiday of Sukkot begins on the fifteenth day of the seventh Jewish month and lasts for seven days. It generally occurs in September or October. The biblical rules of Sukkot are mentioned in five places: Exodus 23:16, 34:22; Leviticus 23:23–43; Numbers 29:12–39; Deuteronomy 16:13–15. Leviticus 23:40 states that the Israelites should take four species on the first day and “rejoice before the Lord your God seven days.” While the latter words indicate that the Israelites are to use the species “before the Lord,” meaning in the temple, the rabbis extended the requirement and said Jews should use them even outside the temple. While the Hebrew words used for the four species are obscure, the Jewish Publication Society’s 1960 translation defines them as “the fruit of goodly trees, branches of palm trees, and boughs of thick trees, and willows of the brook.” A separate command in verse 42 states, “Ye shall dwell in booths seven days.”
The first biblical description of the implementation of this command is in the biblical book Nehemiah. It is entirely different than the way the holiday is celebrated today. It is as if the author of Nehemiah who states he read the law in the Torah, had a different text. The holiday is not called Sukkot but chag, meaning “holiday.” Not four but five items are taken and at least three of the five, and perhaps four, seem unlike the four mentioned in Leviticus. And most startlingly, the people were told to use the five items to build sukkot.
Scholars differ on the question of when Nehemiah lived and when the book that bears his name was edited. All agree that these events occurred more than a century after some Judeans returned to Judea after the Babylonian exile in 536 BCE. He may have been in Israel around 430 BCE, but perhaps later. The book states in 8:17, that the holiday had not been observed since the days of Joshua. In 8:14, the book records that the Judeans “found written in the Torah how the Lord had commanded by Moses that the Israelites should dwell in booths (sukkot) in the holiday (chag) of the seventh month [and proclaims], Go to the mountain and fetch olive branches (zayit), and branches of wild olive (eitz shemen), and myrtle (hadas) branches, and palm (temarim) branches, and branches of thick trees (eitz abot) to make booths (sukkot).”
Since the holiday is not called Sukkot in Nehemiah, but chag, the practice of taking four species is not mentioned, and the key requirement was to build a sukkah made of five species, it seems apparent that the holiday was named Sukkot after 430 BCE, when its practices and significance were changed, and the biblical mandates were placed in the Torah when these changes were made.
This is the view of Arnold B. Ehrlich in his Mikra Ki-Pheshuto (The Bible According to its Literal Meaning). He writes that originally, the ancient Israelites celebrated only one harvest festival. It was the fall festival which concluded all the harvests and was simply called chag, and was “the festival.” Passover and Shavuot did not exist at this time. This is supported by I Kings 8:2, 65; Nehemiah 8:14; II Chronicles 5:3 and 7:8 where the holiday is called chag and there is no mention of Passover or Shavuot. Also, in 932 BE, when Jeroboam led the ten tribes, seceded from the rule of Solomon’s son Rehoboam’s kingdom in Judea, created a new country, Israel, and changed the holiday chag from the seventh to the eighth month to differentiate Israel’s worship from the traditional worship in Judea, the holiday is called chag in I Kings 12:32. Jeroboam did not change Passover and Shavuot, Ehrlich states, because they did not exist.
Additionally, Ehrlich argues, Leviticus 23:43 gives the reason for dwelling in sukkot because the Israelites dwelt in sukkot when they left Egypt. This seems to be a late forced interpretation. There is no mention in the text that the Israelites dwelt in sukkot except for this verse. Secondly, if the holiday is celebrated as a recollection of how the Israelites lived when they left Egypt, the holiday should have been celebrated in the spring, during the season when the Israelites left Egypt. The rabbis were bothered by these questions and responded that the sukkot mentioned in the Bible are the clouds that are mentioned in the Torah (Exodus 13:21) that covered the Israelites during the forty years in the desert and protected them, and the holiday is celebrated in the fall because of its second significance of being a harvest festival.
When did the holiday called Sukkot, in contrast to the harvest holiday chag, begin? Ehrlich imagines that in ancient times the Israelite pilgrims coming to the then-small Jerusalem city to celebrate chag were unable to find lodging and had to make do with hastily constructed booths (Hebrew, sukkot). This was so onerous that many pilgrims stayed home. To counteract this “strike,” Israelite leadership, most likely the priests of the Second Temple period (520 BCE-70 CE), mandated that all Israelites dwell in sukkot during chag as a way of joining the pilgrims who had traveled to Jerusalem. The priestly plan worked. Since the Israelites had to dwell in sukkot wherever they were located, they resumed coming to the temple during chag and the holiday assumed the name of its new main practice. The prophet Zechariah, who lived at this time, reflected the failure of many Jews coming to Jerusalem. He called the holiday Sukkot, and threatened the people that if they do not travel to Jerusalem for this holiday “there shall be no rain” (14:17). He does not mention Passover or Shavuot.
 The Sadducees, Samaritans, and Karaites also understood the Leviticus command to construct the sukkah of these items. Each is arguably reflecting the ancient practice. Rabbi Yehudah in the Babylonian Talmud, Sukkah 36b, said “The sukkah must be constructed of the same four species as the lulov,” although Rabbi Meir ruled that the sukkah can be made of any material. Rabbi Yehudah’s view may reflect some recollection of the ancient practice.
 This may mean that the holiday was not observed in this manner in the past, but was observed as a harvest festival.
 Ehrlich argued that clouds are not huts; at most they are ceilings without walls.
 Ehrlich states that some Israelites objected to the new requirement to dwell in huts for seven days. He theorizes that these resisters inserted into Genesis 33:17 that when the patriarch Jacob returned to Canaan he built a house for himself and sukkot for his cattle, for sukkot are only fit for animals.