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Holy Zohar text. Daily Zohar -549.

Hebrew translation:

וּבְמֹשֶׁה נֶאֱמַר שַׁל נְעָלֶיךָ מֵעַל רַגְלֶיךָ, זֶה בְּהֵפֶךְ שֶׁל אֲחֵרִים, שֶׁלֹּא צָרִיךְ לְהֵרָאוֹת לִפְנֵי הַשְּׁכִינָה עִם קְלִפָּה, וְסוֹד הַדָּבָר – כִּי אֵין לָבֹא אֶל שַׁעַר הַמֶּלֶךְ בִּלְבוּשׁ שָׂק, וְלָאָבוֹת לֹא נִרְאָה אֶלָּא בַנְּעָלִים, זֶהוּ שֶׁכָּתוּב מַה יָּפוּ פְעָמַיִךְ בַּנְּעָלִים בַּת נָדִיב, אֲבָל לְמֹשֶׁה בְּלִי כִסּוּי כְּלָל, וְסוֹד הַדָּבָר – וָאֵרָא אֶל אַבְרָהָם אֶל יִצְחָק וְאֶל יַעֲקֹב בְּאֵ”ל שַׁדַּ”י וּשְׁמִי יהו”ה לֹא נוֹדַעְתִּי לָהֶם, וּבְמֹשֶׁה נֶאֱמַר וְאָמְרוּ לִ”י מַה שְּׁמ”וֹ מָ”ה אוֹמַר אֲלֵיהֶם.

Tikkun 26 – 7

The shoes are part of the Klipa of Malchut. Moses had to take off his shoes to be able to come closer to God.
The Zohar explains that we can not come closer to the king with negativity as it is said in Esther 4:2
“ וַיָּבוֹא, עַד לִפְנֵי שַׁעַר-הַמֶּלֶךְ: כִּי אֵין לָבוֹא אֶל-שַׁעַר הַמֶּלֶךְ, בִּלְבוּשׁ שָׂק ”
“and he came even before the king’s gate; for none might enter within the king’s gate clothed with sackcloth. ”

The patriarchs had revelation of God but not of the highest level of the YHVH name.
Exodus 6:3
“וָאֵרָא, אֶל-אַבְרָהָם אֶל-יִצְחָק וְאֶל-יַעֲקֹב–בְּאֵל שַׁדָּי; וּשְׁמִי יְהוָה, לֹא נוֹדַעְתִּי לָהֶם. ”
“and I appeared unto Abraham, unto Isaac, and unto Jacob, as God Almighty, but by My name YHVH I made Me not known to them.”
אֵל שַׁדָּי, are the names of God at the level of Chessed, numerical value 345 as משה, Moses. Their connection prepared the path for Moses to go above their level.

When Moses came closer to the light, God asked him to take off his shoes
Exodus 3:5
“שַׁל-נְעָלֶיךָ, מֵעַל רַגְלֶיךָ–כִּי הַמָּקוֹם אֲשֶׁר אַתָּה עוֹמֵד עָלָיו, אַדְמַת-קֹדֶשׁ הוּא. ”
“Take off your shoes from off your feet, for the place where you stand is holy ground.”
The shoes represent the Klipa of Malchut with ‘gravity’ to the negative levels. The first word, ‘Take off’, שַׁל, literally translates to ‘Shed’ like ‘shed your cloths’.
Moses needed to shed the lower levels off himself to approach God in the burning bush scene and to climb to the level of Da’at. Da’at is one above the levels of the Patriarchs.

Spiritual advice: Never throw shoes with anger. It activates a strong Klipa.
When you are wearing shoes with laces or any kind of fasteners, always wear the right shoe first but bind the left one first. You separate the right from the Klipa and limit the left from connecting to it.