במדבר, פרק כ״ח, פסוק י״ז

The fifteenth day of the month marks a designated time carrying the specific obligation to eat unleavened bread. When discussing Passover, the Torah explicitly reserves the term "festival" solely for this fifteenth day. Although the sages draw legal parallels between the intermediate days of Passover and those of Sukkot, a clear practical difference exists regarding their sacrifices. Sukkot requires a significantly greater number of offerings. Because of this abundance of sacrifices, the sages traditionally refer to Sukkot simply as "the festival," distinguishing its sacrificial weight from that of Passover [העמק דבר].

An apparent extra emphasis specifying this particular month serves a precise legal purpose. The sages explain that it acts as an exclusion, ensuring that the strict duty to eat unleavened bread does not mistakenly extend to Sukkot. Instead, the obligation remains tied exclusively to this exact time of year [אור החיים].