Commentary for Sanhedrin 21:13

מיתיבי כמה עיבור השנה שלשים יום רבן שמעון בן גמליאל אומר חדש אמר רב פפא רצו חדש רצו שלשים יום

and, as his return was delayed, the year was intercalated subject to Rabban Gamaliel's later approval. When Rabban Gamaliel returned he gave his approval with the result that the intercalation held good. Our Rabbis taught: A year may not be intercalated except where it is necessary either for [the improvement of] roads<span class="x" onmousemove="('comment',' Which are impassable by those coming from afar to celebrate the Passover at Jerusalem. ');">²³</span>

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