In Jewish mysticism, the Chamber of Guf, also called the Otzar, is the Hall of Souls located in the Seventh Heaven. Every human soul is held to emanate from the Guf. The Talmud teaches that the Messiah will not come until the Guf is emptied of all its souls.
In keeping with other Jewish legends that envision souls as bird-like, the Guf is sometimes described as a columbarium, or birdhouse. Folklore says sparrows can see the soul’s descent and this explains their joyous chirping.
The mystic significance of the Guf is that each person is important and has a unique role which only each person, with their unique soul, can fulfill. Even a newborn baby brings the Messiah closer simply by being born.
The peculiar idiom of describing the treasury of souls may be connected to the mythic tradition of Adam Kadmon, the primordial man. Adam Kadmon was a supernal being, androgynous and equal in size with the universe. According to Kabbalah, every human soul is a fragment cycling out of the great world soul of Adam Kadmon. Hence, every human soul comes from the Chamber of Guf.