Reference for Niddah 100:36

כותים היו שם וחשבו עליה לאכילה

ruled, Even if intended for a dog it is unclean.<span class="x" onmousemove="('comment',' Food-uncleanness. It conveys uncleanness to other foodstuffs through contact, without being rendered susceptible. ');">³¹</span>

Jastrow

Jastrow

Jastrow

Jastrow