Reference for Bava Kamma 7:1

ולא ראי השן שאין כוונתו להזיק כראי הקרן שכוונתו להזיק

nor are the aspects of Tooth, which is not prompted by malicious intention to injure, [of such order of gravity] as those of Horn which is prompted by malicious intention to do damage.<span class="x" onmousemove="('comment',' And therefore the liability of Horn could not be derived from that of Tooth. ');">¹</span>

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