Reference for Chullin 16:30

השתא נמי מיחלף ליה

Well, even now, he might get them mixed! - No; since he must have two separate knives he will make a distinguishing mark on each.<span class="x" onmousemove="('comment',' As regards the third knife, the knife for slaughtering, there is no fear that he will use it for any other purpose because of the danger of damaging or notching it.');">¹⁵</span>

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