Reference for Zevachim 188:5

וכ"ת משום דמקדח אי הכי חיטי ושערי נמי הנך אית להו רירי א"ה שלחים נמי התם קעביד לישה

if so, the same applies to wheat and barley too? -This [linseed] emits mucus.<span class="x" onmousemove="('comment',' Thin threads of mucus ooze from these seeds when they are put into water, which fastens them together.');">⁵</span> If so, the same applies to [undressed] hides?<span class="x" onmousemove="('comment',' From these too a mucus issues in water.');">⁶</span> - There he kneads.<span class="x" onmousemove="('comment',' When the mucus causes the linseed to stick together, it is a kind of kneading, for which he is culpable. But kneading is inapplicable to hides.');">⁷</span>

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