The Zohar tells us that the generation that left Egypt knew the ways of the spiritual system because Moses revealed it to them in the wilderness.
He did that on the day he left the world as it said in Deuteronomy 31:2
“וַיֹּאמֶר אֲלֵהֶם, בֶּן-מֵאָה וְעֶשְׂרִים שָׁנָה אָנֹכִי הַיּוֹם–לֹא-אוּכַל עוֹד, לָצֵאת וְלָבוֹא; וַיהוָה אָמַר אֵלַי, לֹא תַעֲבֹר אֶת-הַיַּרְדֵּן הַזֶּה”
“And he said to them, “I am 120 years old today. I am no longer able to go out and come in. YHVH has said to me, ‘You shall not go over this Jordan.’”
Moses didn’t have permission to reveal all the secrets until his last day.
“וְעַתָּה, כִּתְבוּ לָכֶם אֶת-הַשִּׁירָה הַזֹּאת, וְלַמְּדָהּ אֶת-בְּנֵי-יִשְׂרָאֵל, שִׂימָהּ בְּפִיהֶם: לְמַעַן תִּהְיֶה-לִּי הַשִּׁירָה הַזֹּאת, לְעֵד–בִּבְנֵי יִשְׂרָאֵל.”
““Now therefore write this song (the Torah) and teach it to the people of Israel. Put it in their mouths, that this song (Torah) may be a witness for me among the people of Israel.”
When Moses revealed the secrets he didn’t say “Hear O’ Israel” but (Deuteronomy 32:1) “הַאֲזִינוּ הַשָּׁמַיִם, וַאֲדַבֵּרָה” “Hear, heavens, and I will speak!”
We know that Rabbi Shimon revealed great secrets in the Idra Zuta on the day he left the world. Like Moses, he started his revelations addressing the heavens. We also know that the Idra Zuta revelation was done only by Rabbi Shimon. The study and revelation made in the Idra Rabba were with Rabbi Shimon and all his students.
The image below shows the two special Torah columns with the last words of Moses. They are arranged in a special form of two gates or one gate if you place the two columns on top of each other.
The form we receive is 6+( 35 + 35=70 ) + 6. This is the ‘Shield of David’. This is the aspect of the 70 righteous souls who escorted Rabbi Shimon in his ascend to heavens and many more secrets that can fill a book to explain. It’s a Torah Awe/Wow moment for those who are studying the Zohar for a while.
Read the commentary to DZ 1625 to understand the deeper connection between Moses and Rabbi Shimon.