Reference for Sanhedrin 194:6

ולא כר' שמלאי שהיה דורש (תהלים פ, ו) האכלתם לחם דמעה ותשקמו בדמעות שליש

and some in the war of Gog and Magog, and the remaining [period] will be the Messianic era, whilst the Holy One, blessed be He, will renew his world only after seven thousand years.' R. Abba the son of Raba said: The statement was after five thousand years. It has been taught; R. Nathan said: This verse pierces and descends to the very abyss:<span class="x" onmousemove="('comment',' Just as the bottom of an abyss cannot be reached, so is it impossible to grasp the full purport of this verse (Rashi). ');">¹¹</span>

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