The 84th prohibition is that we are forbidden from using the anointing oil which was made by Moshe to anoint anyone other than kohanim gedolim or kings.
The source of this mitzvah is G‑d's statement1 (exalted be He), "Do not pour it on the skin of any [unauthorized] person."
It is clear that the one who anoints himself2 is punished by kares, "[If a person blends a similar formula] or places it on an unauthorized person, he shall be cut off [from his people]." If he did so unintentionally, he must bring a sin offering.
The details of this mitzvah are explained in the beginning of tractate Kerisus.3
