Reference for Bekhorot 63:13

אידי ואידי בגסה ולא פליגי מר כי אתריה ומר כי אתריה

The teacher [who forbids] refers to the bones of small cattle, and the other refers to bones of large cattle.<span class="x" onmousemove="('comment',' Which may be fashioned into vessels or instruments like flutes, and therefore selling the flesh in conjunction with the bones is permissible, as it will be said that the price is for the bones, since these can be of use.');">⁸</span>

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