Reference for Yoma 116:5

תלמוד לומר ויצא אל המזבח היכן היה לפנים מן המזבח

AND HE WOULD SPRINKLE EVERY HORN FROM BELOW UPWARDS, WITH THE EXCEPTION OF THE HORN AT WHICH HE WAS STANDING, WHICH HE WOULD SPRINKLE FROM ABOVE DOWNWARDS. THEN HE SPRINKLED THE TOP<span class="x" onmousemove="('comment',' This word is variously interpreted in the GEMARA: It may mean 'back', i.e., top; it has been claimed as 'the pure, real surface' (of gold) i.e., free from coals or ashes; as the centre of the altar front.');">⁶</span>

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