Talmud Bavli
Talmud Bavli

Commentary for Shabbat 228:3

וליתקע כי היכי דלידעי דשרי בקניבת ירק מן המנחה ולמעלה אמר רב יוסף לפי שאין דוחין שבות להתיר

Whereupon I said to him, The priests<span class="x" onmousemove="('comment',' Who burn the fats. ');"><sup>7</sup></span> are zealous.<span class="x" onmousemove="('comment',' They take care to know the law and need no reminder. ');"><sup>8</sup></span> Mar Kashisha son of R. Hisda said to R. Ashi: Do we then say, Priests are zealous? Surely we learnt: Three [blasts were blown] to cause the people to cease work; three, to distinguish between the holy [day] and weekdays?<span class="x" onmousemove="('comment',' This was done in the Temple, and he assumed that it was in order to remind the priests, ');"><sup>9</sup></span>

Tosafot on Shabbat

Rather for trimming vegetables: It seems to R[abbenu] Y[itzchok] that [this verse is used here] as a support [for a Rabbinic enactment], for if it is [prohibited] by Torah, it would be prohibited on Yom Kippur as well.  Even though it says in Chapter Klal Gadol (73b) "one who trims beets is liable twice", there it referring to [beets that are] attached [to the ground].  Here it is referring to harvested [vegetables], as Rashi explained. This is also not similar to what is said in Chapter Klal Gadol (74b) "One who minces beets is liable for [transgressing the Melachah of] Grinding", because there he is making very fine pieces whereas here he is making large pieces. 
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