Reference for Bava Kamma 91:4

וכי תימא הכי נמי והתנן כסהו כראוי ונפל לתוכו שור או חמור ומת פטור

that a cover would no more be of any avail for such a [pit]? And if you say that this is indeed the case, have we not learnt, 'Where it had been covered properly and an ox or an ass has [nevertheless] fallen into it there is exemption'?<span class="x" onmousemove="('comment',' Infra 52a. ');">³</span>

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