Reference for Chullin 61:20

בד"א בזמן שהוליך ולא הביא וכו':

R'Manasseh said: The Mishnah refers to a lancet which has no projections.<span class="x" onmousemove="('comment',' Lit., 'horns'. The projection or point would pierce the organs during the slaughtering thus rendering it invalid.');">⁵</span>

Jastrow