The 329th prohibition is that we are forbidden from performing melachah1 on Yom Kippur.
The source of this commandment is G‑d's statement,2 "Do not do any melachah [on this day, because it is a day of atonement]."
If one intentionally transgresses this commandment, the punishment is kores3 as explained in Scripture.4 If the act was unintentional, he must bring a sin-offering.5
The details of this commandment are explained in tractate Beitza6 and Megillah.7
See first footnote in N320.
Lev. 23:28.
See Principle 14, where the Rambam defines kores as losing one's portion in the World to Come (unless the person does teshuvah before death). See also Hilchos Teshuvah, Chapter 8, Halachah 1.
Lev. 23:30. "If one does any work on this day, I will destroy him [i.e., punish him with kores] from among his people."
See P69. This offering is called a "fixed sin-offering," to distinguish it from the offering of adjustable value (P72).
18b.
30b.
