Reference for Pesachim 54:1

מכלל דרבנן דפליגי עליה שרו אפי' כשאבוקה כנגדו אלא עצים דאיסורא לרבנן היכי משכחת להו א"ר אמי בר חמא בשרשיפא

Whence it follows that the Rabbis who disagree with him permit it even when the flame is opposite it; then how is forbidden fuel conceivable according to the Rabbis?<span class="x" onmousemove="('comment',' I.e., when do they prohibit benefit from forbidden fuel?');">¹</span> - Said R'Ammi B'Hama: In the case of a stool.<span class="x" onmousemove="('comment',' Made of forbidden wood. One must not sit upon it, because he thereby benefits from the wood while it is yet fully in existence.');">²</span>

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow