Reference for Bava Kamma 143:2

ואלא מאי שנא רישא ומאי שנא סיפא

— He replied: In the earlier clause<span class="x" onmousemove="('comment',' Where liability is stated. ');">¹</span> we can rightly apply to the offence [the words] <i>'and he slaughters it'</i>, [in the sense that] the whole act is unlawful,<span class="x" onmousemove="('comment',' As the slaughter took place while the father was still alive. ');">³</span>

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