Reference for Yoma 57:3

א"ר אבהו מ"ט דרבי דכתיב (תהלים כב, א) למנצח על אילת השחר מה אילה זו קרניה מפצילות לכאן ולכאן אף שחר זה מפציע לכאן ולכאן

It is harder to remember well something old than to commit to memory a fresh thing, your analogy being a cement made out of old cement.<span class="x" onmousemove="('comment',' That has been used before. It is hard to dissolve it and re-make it.');">⁵</span> R'Abbahu said: What is the reason of Rabbi's opinion?<span class="x" onmousemove="('comment',' Who says that the light column of the sun (dawn) is scattered.');">⁶</span>

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