When the Lord descended upon Mount Sinai the Hebrew people were ordered to previously prepare and cleanse themselves. In the Divine service we have not a lesser event than God’s descent upon Mount Sinai, but a greater one: here before us is the very face of God the Lawgiver.

When the Lord appeared to Moses upon Mount Horeb in the bush, he was ordered to put off his shoes from his feet; but here is a greater manifestation of God than upon Horeb; there was only the prototype, here is the Typifier Himself.

 St John of Kronstadt

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I saw also the Lord sitting upon a throne, high and lifted up, and his train filled the temple. Above it stood the seraphims: each one had six wings; with twain he covered his face, and with twain he covered his feet, and with twain he did fly. And one cried unto another, and said, Holy, holy, holy, is the Lord of hosts: the whole earth is full of his glory. And the posts of the door moved at the voice of him that cried, and the house was filled with smoke. Then said I, Woe is me! for I am undone; because I am a man of unclean lips, and I dwell in the midst of a people of unclean lips: for mine eyes have seen the King, the Lord of hosts. Then flew one of the seraphims unto me, having a live coal in his hand, which he had taken with the tongs from off the altar: And he laid it upon my mouth, and said, Lo, this hath touched thy lips; and thine iniquity is taken away, and thy sin purged.

- Isaiah 6:1-7