From Chabad.org: Now that G‑d’s presence graces the Tabernacle, G‑d instructs the Jewish people to banish certain ritually impure individuals from their encampments. Most of them were only barred from entering the Tabernacle area and its immediate environs. Only one who suffered from tzara’at (“leprosy”) was sent out of the general encampment. This section then discusses the restitution and Temple sacrifice required of one who robs his fellow and then falsely swears to maintain his innocence. If one robs a convert who then dies without leaving any heirs, the restitution is made to a priest. Also included in this section is the mitzvah to verbally confess one’s sins, and a person’s right to select a priest of his liking to whom to give the various required priestly gifts.
The concept of “Viduy”, or verbal confession, is a powerful tool used by many, and for different reasons. Sales pitches often include not only visualizing success, but physically writing something down, making it a more tangible goal, literally. Speaking out sins has a similar effect, for it makes it more difficult to mentally block us from denying those actions from having ever happened, helps us admit that it was wrong, so we can move on and correct those actions. Emotional therapy, support groups, and even schools base much of what they do on this concept, and it all started in the Torah!