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https://pitputim.me/2015/05/22/letter-from-lubavitcher-rebbe-%d7%a0%d7%a2-to-the-rav-%d7%a0%d7%b3%d7%a2-before-shavuos/
Letter from Lubavitcher Rebbe נ'ע to the Rav נ׳ע before Shavuos