Zohar Shelach Lecha
There are three hundred openings in the Tower. In the central opening stands a light in the shape of the Torah scroll that the king of Israel would read in it in the future. That would be the King Mashiach and no other.
The three hundred openings refer to the upper three sefirot because each one of them includes a hundred. The opening in the middle implies the center column. The reading of the portion of Vayakhel by the Mashiach is the secret of revealing the upper three Sefirot of Chokmah, and it can be done only at the end of the Tikun and not before it.
Happy those who listen from the mouth of the Mashiach the pleasantness of his words explaining the concealed lights of the six sefirot of Zeir Anpin of Chokmah from the Torah scroll on days of Rosh Chodesh, Shabbats, holidays, and events.
When the Yeshiva scholars want to go up to the Yeshiva of the heavens, that is the Yeshivah of the angel Metat-, they gather around the King Mashiach, and he explains the Torah words. With the sweetness of his explanations and their desire, they go up to the Yeshivah in the heavens.
All ten things that King Mashiach explained are stored hidden for you until the day you raise the questions and pray for it.
When the tower stands in the middle of the Temple’s court, and the opening of the center column is open, the Cherubs open their mouths and spread their wings to hide the Light of the upper three sefirot of Chokmah that was discussed above. They shine with supernal light on that opening, the Torah scroll is open, and the Cherubs say; Psalms 31:20 “מָה רַב טוּבְךָ אֲשֶׁר צָפַנְתָּ לִּירֵאֶיךָ פָּעַלְתָּ לַחֹסִים בָּךְ נֶגֶד בְּנֵי אָדָם”
“Oh, how great is Your goodness, Which You have laid up for those who fear You, Which You have prepared for those who trust in You In the presence of the sons of men!”
Then the openings are closed, and the Torah scroll is rolled back to its place.