Reference for Bava Batra 23:8

בבבל מאי אמר רב יוסף בי רדו יומא

What is the rule in Babylon? — R. Joseph said: [There must be] a day's ploughing [for each]. What is meant by a day's ploughing? If a day's ploughing in seed time,<span class="x" onmousemove="('comment',' When the ground is soft, having been already broken up by the first ploughing in the autumn. ');">⁶</span>

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