Reference for Moed Katan 5:10
וקשקוש בשביעית מי שרי והא כתיב (שמות כג, יא) והשביעית תשמטנה ונטשתה תשמטנה מלקשקש ונטשתה מלסקל
Now, as 'sowing' was already embraced in the general terms of the ordinance,<span class="x" onmousemove="('comment',' Lev. XXV, 4: But the seventh year shall be a sabbath of solemn rest for the land, a sabbath unto the Lord, in direct contrast to verse 3; there was therefore no further need to continue with specific instances of the prohibition, such as sowing the field and pruning the vineyard.');"><sup>12</sup></span> why then was it singled out [for mention]? To provide ground for an analogy, namely that just as sowing has the special quality of being a work common to field and orchard,<span class="x" onmousemove="('comment',' I.e.,common to both, agriculture and horticulture.');"><sup>13</sup></span>