"And the people stood far off, but Moses drew near" (Exodus 20:18). From the Place [or: from the House of Choosing, the future Temple site] it was spoken with him, as you say "And he saw the place from afar" (Genesis 22:4). This teaches that he entered a place where the ministering angels have no permission to enter, as it is said "And Moses drew near to the thick darkness." And so Solomon said "The LORD said that He would dwell in the thick darkness" (I Kings 8:12). And so it says "And he was there with the LORD" (Exodus 34:28).
Moses Entered the Darkness Where No Angel May Go
Yalkut Shimoni on Torah 301:3
וַיַּעֲמֹד הָעָם מֵרָחֹק וּמֹשֶׁה נִגַּשׁ, מִבֵּית הַבְּחִירָה נִדְבַּר עִמּוֹ, כְּמָה דְאַתּ אָמֵר (בראשית כב, ד) "וַיַּרְא אֶת הַמָּקוֹם מֵרָחֹק", מְלַמֵּד שֶׁנִּכְנַס לְמָקוֹם שֶׁאֵין רְשׁוּת לְמַלְאֲכֵי הַשָּׁרֵת לִיכָּנֵס, שֶׁנֶּאֱמַר וּמֹשֶׁה נִגַּשׁ אֶל הָעֲרָפֶל. וְכֵן שְׁלֹמֹה אָמַר, (מלכים א ח, יב) "ה' אָמַר לִשְׁכֹּן בָּעֲרָפֶל", וְכֵן הוּא אוֹמֵר, "וַיְהִי שָׁם עִם ה'".