Commentary for Rosh Hashanah 41:1

תרי ירחי חסירי קלא אית להו

- If two [successive] months<span class="x" onmousemove="('comment',' Viz., (apparently) Ab and Elul, or Tebeth and Shebat. Rashi: Tebeth and Tammuz are always, according to the principles of fixed calendar, defective, and if Shebat' which follows Tebeth, Ab and Tammuz were also to be defective, it would have become known to the Diaspora before the advent of the festivals.');">¹</span> are declared short, the thing becomes known. Levi once arrived in Babylon on the eleventh of Tishri.<span class="x" onmousemove="('comment',' I.e., according to the reckoning of the Babylonians who were not aware that the previous month had been prolonged in Palestine by one day. huk He either came from near the frontier or just before nightfall, before they had broken their fast (v. Tosaf. s.v.) .');">²</span>

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