Moses was not able to enter in, partly because of the extraordinary thickness and brightness of the cloud, which both dazzled his eyes and struck him with horror, as 1 Kings 8:11; and partly, because of his great reverence and dread of that eminent and glorious appearance of God; and partly, because he was not called to it, as he was not able to go up into the mount till he was called, Exodus 24:16.
Related Commentaries of Exodus 40:35
Exodus 40:35
35 And Moses was not able to enter into the tent of the congregation, because the cloud abode thereon, and the glory of the LORD filled the tabernacle.