Feast Of Tabernacles (Heb. 'hag hassulcoth), one of the three great festivals of the Jews, observed after harvest, and beginning on the 15th day of the month Tisri. It commemorated God's protecting care over his people while they dwelt in the wilderness. It was also a harvest feast or thanksgiving. It continued eight (among the exiled Jews nine) days, the first and last (in exile the first two and last two) of which were the most important. To the ceremonies of the festival belongs the waving toward the four quarters of the world of fine fruits and leafy branches, with the singing of liturgical songs, commonly called, from the repetition of the words hosia' na (Oh save!), Hosanna. On the seventh day this was repeated, for the last time, with greater solemnity. During the first seven days the living in booths was obligatory, which is still partially observed by the Jews in most countries. Sacrifices took place in the temple, and in later times also a ceremony of "pouring water " on the sacrifice, and a great illumination of the outer court, with dances by torchlight.