The High Priest Entering the Holy of Holies Once a Year
The single annual moment when one designated person could enter the innermost sanctuary becomes, in Kabbalistic reading, a symbol for the rare, momentary access any consciousness can have to the undifferentiated root of all the sefirot.
Leviticus 16 lays out the Yom Kippur service in detail: the High Priest alone, and only on this one day of the year, may pass beyond the curtain into the Holy of Holies, carrying incense and blood for atonement, on pain of death if the procedure is done incorrectly. Kabbalistic reading treats the Holy of Holies as corresponding to the highest, most unified point of the sefirotic structure, close to where differentiation among the sefirot has not yet fully occurred — meaning that what the High Priest briefly enters is not simply a more sacred room but a state closer to the divine's own undivided root. The restriction to one man, one day, one year is read as proof that such contact cannot be sustained or routine; it is a threshold experience, not a place one lives. The concluding statement that this is "a statute forever... to make atonement... once a year" is taken kabbalistically to mean that human consciousness, structurally, gets exactly one reliable window per cycle to brush against that undivided root before returning to ordinary, differentiated existence.
a statute forever... to make atonement... once a year
Leviticus