Talmud for Sanhedrin 83:1

ותרוייהו כר' יוחנן סבירא להו הא למיהוי כי יתרא הא למיהוי כי נפיא

Now, both agree with R. Johanan,<span class="x" onmousemove="('comment',' That the recital of the benediction is conditioned by the filling up of the moon's concavity. ');">¹</span> butthe one [explains it as meaning]: Until it is like a strungbow;<span class="x" onmousemove="('comment',' I.e., semicircular, which shape it assumes after seven days. ');">²</span>

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