Reference for Rosh Hashanah 9:5
אימא עצרת חד יומא אמר רבא אטו עצרת יומי מנינן שבועי לא מנינן והאמר מר מצוה למימני יומי ומצוה למימני שבועי ועוד חג שבועות כתיב
[indicating that] just as the new moon [is sanctified for the period corresponding with the unit of time] by which it is counted,<span class="x" onmousemove="('comment',' It is counted by days and is sanctified for one day.');"><sup>8</sup></span> so the Feast of Weeks [is sanctified for the period corresponding with the unit of time] by which it is counted.<span class="x" onmousemove="('comment',' It is counted by weeks and is sanctified for one week.');"><sup>9</sup></span>
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