Reference for Bava Kamma 102:8

או דלמא נסתלקו מעשה ראשון וקמה ליה כוליה ברשותיה תיקו:

where the first digger made the pit of the minimum depth capable of killing, and yet it was said that the second would be liable? — It may be answered that the case there was where the unhealthy air was not sufficient to kill,<span class="x" onmousemove="('comment',' As where its width was more than its depth. ');">⁶</span>

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