Reference for Bava Batra 37:19
למימרא דזרעים
Yet in spite of mentioning a ditch he also mentions A FULLER'S POOL?<span class="x" onmousemove="('comment',' And therefore he should specify (moist) sand as well. ');"><sup>16</sup></span> — Both of these required to be specified. For if he had mentioned only a ditch. I should have said that this was because it was a fixture, but I should not have included a fuller's pool which is not a fixture.<span class="x" onmousemove="('comment',' Since the fuller may abandon it after a time. ');"><sup>17</sup></span> And if he had mentioned a fuller's pool. I should have said that this was because its waters are stagnant. but I should not have included a ditch [which has running water]. Hence both were necessary. SEEDS AND PLOUGH FURROWS ARE KEPT AWAY etc. Cannot seeds be inferred from plough furrows? — Seeds can be dropped without ploughing. Cannot plough furrows be inferred from seeds?<span class="x" onmousemove="('comment',' Because ploughing is only for the sake of sowing. ');"><sup>18</sup></span> Ploughing can be done for trees.<span class="x" onmousemove="('comment',' Ploughing the ground under trees was supposed to improve them. ');"><sup>19</sup></span> Cannot both be inferred from water?<span class="x" onmousemove="('comment',' Trees and seeds require watering; hence their prohibition could have been inferred from that of moisture. ');"><sup>20</sup></span> — The Tanna is speaking of Eretz Yisrael, of which it is written, it drinketh water of the rain of heaven.<span class="x" onmousemove="('comment',' Deut. XI, 21. And therefore seeds are sown and trees planted in fields where there is no irrigation; hence their prohibition had to be mentioned separately. ');"><sup>21</sup></span> Our Mishnah would imply that seeds