Reference for Chullin 243:10

אלא אי אמרת פלטתו סכין לר' ישמעאל בטיל רב הונא דאמר כמאן

And to this R'Huna added, provided he collected it together.<span class="x" onmousemove="('comment',' This provision implies that the knife had cut away shreds of flesh in a number of places and left them attached to the hide. The fact that one is liable if the pieces were collected together clearly indicates that the hide did not render these shreds negligible, for had they once been rendered negligible the person who touched them would not become unclean and so not be liable for any further consequences.');">⁴</span>

Jastrow

Jastrow