Reference for Bava Kamma 103:9

נפל לתוכו שור חרש שוטה וקטן חייב בן או בת עבד או אמה פטור:

COVERED IT AND THE SECOND ONE CAME ALONG AND FOUND IT OPEN AND [NEVERTHELESS] DID NOT COVER IT, THE SECOND WOULD BE LIABLE. IF [AN OWNER OF A PIT] HAD COVERED IT PROPERLY, AND AN OX OR AN ASS [NEVERTHELESS] FELL INTO IT AND WAS KILLED, HE WOULD BE EXEMPT.<span class="x" onmousemove="('comment',' As he is surely not to blame. ');">⁷</span>

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