Commentary for Sanhedrin 199:7

אמר ליה הא [האי] סיועי קא מסייע (ליה) [לך] אלא אי שמיע לך הא שמיע לך כי הא דיתיב רבי יוחנן וקא דריש עתיד הקב"ה להביא אבנים טובות ומרגליות שהן שלשים על שלשים אמות וחוקק בהם עשר ברום עשרים ומעמידן בשערי ירושלים שנאמר (ישעיהו נד, יב) ושמתי כדכוד שמשותיך ושעריך לאבני אקדח וגו' לגלג עליו אותו תלמיד אמר השתא כביעתא דצילצלא לא משכחינן כולי האי משכחינן

He replied: But he merely supported you! But if you have heard of something [which may be dubbed irreverent] it is this: R. Johanan was sitting and teaching: The Holy One, blessed be He, will bring jewels and precious stones, each thirty cubits long, and thirty cubits high, and make an engraving in them, ten by twenty cubits, and set them up as the gates of Jerusalem, for it is written, And I will make thy windows of agates, and thy gates of carbuncles.<span class="x" onmousemove="('comment',' Isa. LIV, 12. ');">¹²</span> A certain disciple derided him saying, 'We do not find a jewel even as large as a dove's egg, yet such huge ones are to exist!' Some time later he took a sea journey and saw the ministering angels cutting precious stones and pearls. He said unto them: 'For what are these?' They replied: 'The Holy One, blessed be He, will set them up as the gates of Jerusalem.' On his return, he found R. Johanan sitting and teaching. He said to him: 'Expound, O Master, and it is indeed fitting for you to expound, for even as you did say, so did I myself see.' 'Wretch!' he exclaimed, 'had you not seen, you would not have believed! You deride the words of the Sages!' He set his eyes upon him, and he turned in to a heap of bones.<span class="x" onmousemove="('comment',' V. B. B. 75a. ');">¹³</span>

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