Reference for Shabbat 101:2

<big><strong>מתני׳</strong></big> לא כסהו מבעוד יום לא יכסנו משתחשך כסהו ונתגלה מותר לכסותו ממלא את הקיתון ונותן לתחת הכר או תחת הכסת:

or tithes,<span class="x" onmousemove="('comment',' Having been tithed before they were placed in the earth they are not to be retithed on removal, as though this were a new harvest. ');">³</span> and they may be removed on the Sabbath.<span class="x" onmousemove="('comment',' On this account the proviso is made that some of the leaves must be uncovered, for otherwise it would be necessary to remove the earth, which may not be done. But the other statements hold good even if they are entirely covered (Rashi and Tosaf.). ');">⁴</span>

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