« Previous Negative Commandment 325 Next » Negative Commandment 327 The 326th prohibition is that we are forbidden to perform melachah on Rosh HaShanah. The source of this commandment is G‑d's statement1, "No servile melachah may be done [on that day]." Sefer HaMitzvot « Previous Negative Commandment 325 Next » Negative Commandment 327 Footnotes 1. Lev. 23:25.