Charles Spurgeon Commentary Exodus 3:3-5

"And Moses said, I will turn aside now, and see this great sight, why the bush is not burnt. And when Jehovah saw that he turned aside to see, God called unto him out of the midst of the bush, and said, Moses, Moses. And he said, Here am I. And he said, Draw not nigh hither: put off thy shoes from off thy feet, for the place whereon thou standest is holy ground." — Exodus 3:3-5 (ASV)

And Moses said, I will now turn aside, and see this great sight, why the bush is not burnt. And when the LORD saw that he turned aside to see, God called unto him out of the midst of the bush, and said, Moses, Moses. And he said, Here am I. And he said, Draw not nigh hither: put off thy shoes from off thy feet, for the place whereon thou standest is holy ground.

God is not to be viewed by curiosity; he is not to be approached by presumption. A holy trembling well suits the man who would commune with the most holy God. We are not fit for communion with God without some measure of preparation. There is something to be put off before we can behold the Lord.