Reference for Chullin 249:20

עצמות קדשים ששימשו נותר מטמאין את הידים הואיל ונעשה בסיס לדבר האסור

Furthermore, why does the thigh-bone of a carcass or of a [dead] reptile, even when pierced, convey uncleanness?<span class="x" onmousemove="('comment',' The bone is clearly a protection for the marrow that is within it, and it ha been established (supra 117b, in the very first ruling of this chapter) that a protection can be included and reckoned together with the foodstuff only to convey the light uncleanness i.e., to render other foodstuffs unclean, but not to convey the grave uncleanness, i.e., to render the person that touches it unclean.');">⁹</span>

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow