As practically all of the book of Leviticus, this week’s Torah portion, acharey mot (Leviticus Ch. 16-18), lists numerous rules regarding how Aharon, the chief priest, is to conduct himself while he is in the Tent of the Meeting (another name for the Tabernacle).
For the Hassidic rabbis, these are just codes for how one should conduct oneself during prayer. The “Tent of the Meeting” is not a physical place for them; it is the deeper realms of one’s consciousness. Entering the Tent of the Meeting (ohel mo’ed) is entering that place within oneself, where one meets one’s Maker.