This Halacha is an excerpt from our Sefer
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The Divine revelation experienced during the Tikkun of Rav Yosef Karo and Rav Shlomo Alkabetz:
The following occurrence was jotted down by Rav Shlomo Alkabetz in a letter attained by the Shlah Hakadosh: Know, that I and the Chassid [Rav Yosef Karo] as well as other colleagues decided to stay awake throughout the entire night of Shavuos. Thanks to the Almighty, we were successful in doing so and did not stop [learning] for even a moment. This is the order that I arranged for the nights learning. First, we read numerous sections from Chumash, then from Tanach, including the entire Megilas Shir Hashirim and Megillas Ruth. All this was done with great awe and trepidation. Afterwards we studied Mishnayos. After the study of Mishnayos we studied Kaballa. At around midnight, after completing the Mishnayos and Kaballah, we heard a loud cryptic voice coming from the mouth of one our comrades, the Chassid. Only we understood what he was saying, while others in the vicinity could not make out the words coming from his mouth. He spoke with such a pleasant voice, and the voice became stronger and louder as each word was spoken. We fell on our faces in great fear and could not lift our heads to lift our face. The voice said as follows: Listen my friends, the scrupulous of the scrupulous, my beloved comrades, Peace to you! Praised are you and praised are your parents. Praised are you in this world and praised are you in the next world over the fact you decided to frown me on this night. For many years my crown has fallen and there is no one to comfort me. I am thrown to the earth, mingling with trash, and now you have returned the crown like old. Be strong my friends and rejoice as you are men of stature, and have merited that your Torah reach Hashem. Your Torah has broken all the heavens and bypassed all the angels, who stand mesmerized at your Torah. I am the Mishneh that has come to speak to you. If only you would have been a quorum of ten I would have been elevated even more…….. It is an opportune time for you to move to Eretz Yisrael and I will promise you peace and prosperity. The Divine spirit taught us Torah and revealed to us many secrets, including prophecies. We performed the same order on the second night, this time though with a quorum of ten. The Divine spirit returned to us as soon as we began reading the Aseres Hadibros and once again praised us for our learning and taught us Torah. It made a second appearance after midnight and taught us Torah for about an hour.
 Shelah Miseches Shavuos
 This paragraph is selected excerpts from the letter and not the full letter.