From manure to stones
Why take stones out? To plow — or to build?
clearing the field is assur; building stone is not
A quarry: cutting building stone from the rock
Not a new quarry in his field…
MishnahNo — unless it already holds three layers of three by three by three high, twenty-seven stones in all→ unless there is real building stone there
3 layers
27 stones a layer, an amah each way
Rash MiShantz: 81 stones in all
Gra: 27 usable stones
How does he know the stone is there?
Rambamhe began quarrying before Shemittah
Othershe can see the stone is there to cut
Sheviis 3:5
Opening a Quarry during Shemittah
פְּתִיחַת מַחְצֵב בַּשְּׁבִיעִית
לֹא יִפְתַּח אָדָם מַחְצֵב בַּתְּחִלָּה לְתוֹךְ שָׂדֵהוּ, עַד שֶׁיִּהְיוּ בוֹ שָׁלֹשׁ מוּרְבִּיּוֹת,
שֶׁהֵם שָׁלֹשׁ עַל שָׁלֹשׁ עַל רוּם שָׁלֹשׁ, שִׁעוּרָן עֶשְׂרִים וְשֶׁבַע אֲבָנִים: