Reference for Chullin 166:15

והכא לא אפשר היכי ליעביד

he is thereby adding to the structure [of the altar and it is written: All this, (said David, do I give thee) in writing, as the Lord hath made me wise by His hand upon me!<span class="x" onmousemove="('comment',' I Chron. XXVIII, 19.');">⁸</span>

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