Reference for Bava Kamma 7:9

וליתנייה בהדיא במועדין מתחילתן קמיירי בתמין ולבסוף מועדין לא קמיירי

But what about Horn? Was it entirely excluded [in the Mishnah]? — [The generalisation,] Whenever damage has occurred, the offender is liable, includes Horn. But why has it not been stated explicitly? — Those which are <i>Mu'ad</i> ab initio are mentioned explicitly [in the Mishnah] but those which initially are <i>Tam</i>,<span class="x" onmousemove="('comment',' As is the case with Horn. ');">⁹</span>

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