Commentary for Sanhedrin 26:3

וליעבריה לאדר אמר רב אחא בר יעקב תנא מלמעלה למטה קחשיב והכי קאמר עד מיעוטו מעברין וכמה מיעוטו ארבעה עשר יום

But why not intercalate a day in Adar?<span class="x" onmousemove="('comment',' Which would bring in the new Tekufah on the thirteenth day, when the moon is still waxing, rather than cause the derangement of a whole month; and though the first day of Passover must not fall on Monday, Wednesday or Friday, and the addition of a day might cause that, it would not matter, because the limitation of the days on which Passover may commence is due to the desire to avoid New Year falling on Sunday, Wednesday or Friday, and that could be avoided by adding a day to one of the normally defective months between Nisan and Tishri. ');">⁷</span> — R. Aha b. Jacob said: The Tanna reckons from higher numbers downward, and says as follows: [If there is a deficiency] as far as [i.e., by more than] the lesser part of the month,<span class="x" onmousemove="('comment',' I.e., down to, but not including, the fourteenth day. ');">⁸</span> the year is intercalated.<span class="x" onmousemove="('comment',' But if there is actually a shortage of fourteen days, only the month Adar is intercalated. ');">⁹</span>

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