Reference for Sanhedrin 144:7

קמ"ל דרודף הוא ואפילו אחר נמי אלא ומת בכל מיתה שאתה יכול להמיתו למה לי

But why deduce 'there shall be blood shed for him', neither on a week day nor on the Sabbath? If he may not be slain on a week day, he may surely not be slain on the Sabbath? — R. Shesheth replied: This is necessary only to teach that a pile [of debris] must be removed for his sake.<span class="x" onmousemove="('comment',' If, in burrowing his way in, he dislodged a pile of masonry, which fell upon him, it must be removed even on the Sabbath, and if the owner does not, he is guilty of bloodshed. ');">⁶</span>

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