Reference for Bava Kamma 102:19

אמר רבינא ואזדו לטעמייהו דתנן השותפין שנדרו הנאה זה מזה אסורין ליכנס לחצר ר"א בן יעקב אומר זה נכנס לתוך שלו וזה נכנס לתוך שלו

the reason being that each handbreadth [full] of water is equivalent [in its capacity to cause death] to two handbreadths without water. The question was thereupon raised: Where a pit is of nine handbreadths but one of these is full of water, what should be the law? Should we say that since there is not so much water there, there is not [so much] unhealthy air,<span class="x" onmousemove="('comment',' And should therefore be subject to the law applicable to a pit of less than ten handbreadths deep. ');">¹⁵</span>

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